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Electrician - Semester II - CITS Module 1: Three Phase and Single Phase Induction Motor, Questions: Level 1, 1, , A, B, C, D, 2, , 4, , What is the formula to calculate the slip, speed (Nslip) of 3 phase squirrel cage, induction motor?, Nslip = Ns - Nr, Nslip = Nr - Ns, N −N, Nslip = s r, Nr, , N −N, Nslip = s r, Ns, , A, B, , Synchronous speed =, , 120P, F, , C, , Synchronous speed =, , 120, PF, , D, , Synchronous speed =, , PF, 120, , 5, A, B, C, D, , What is the fuse rate to run a 10 HP three, phase induction motor at full load?, 10 A, 15 A, 25 A, 30 A, , 6, , What is the name of the contact marked ‘X’?, , What is the type of control circuit?, , A, B, C, D, , Inching control, ON remote control, OFF remote control, Forward & reverse control, , 3, , What is the name of the A.C motor starter?, , X, , A, B, C, D, , Star contact, Delta contact, Auxiliary contact, Over load relay contact, , 7, , Which formula is used to calculate, percentage slip of an AC 3 phase induction, motor?, N − Nr, x 100, %S= s, Ns, , A, , A, B, C, D, , DOL starter, Auto transformer starter, Semi automatic star delta starter, Fully automatic star delta starter, , What is the formula to calculate synchronous, speed of a A.C 3 phase induction motor?, 120F, Synchronous speed =, P, , B, , %S=, , Nr − Ns, x 100, Ns, , C, , %S =, , Ns − Nr, x 100, Nr, , D, , %S =, , Nr − Ns, x 100, Nr, , - NIMI Question Bank -, , Page1/ 10

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8, , Which operation the control circuit is used?, , A, B, C, D, 9, , Remote control, Jogging/Inching, Sequential control, Forward and reverse, What is the name of the part marked ‘X’?, , 13 What is the working principle of single phase, induction motor?, A Lenz’s law, B Joule’s law, C Faraday’s laws of electrolysis, D Faraday’s laws of electromagnetic induction, 14 What is the name of single phase motor?, , A, B, C, D, , Permanent capacitor motor, Induction start capacitor run motor, Capacitor start capacitor run motor, Capacitor start induction run motor, , 15 What is the name of single phase motor?, A, B, C, D, , Shaft, Brushes, Bearings, Slip rings, , 10 Which speed is called as synchronous speed, in 3 phase induction motor?, A No load speed, B Full load speed, C Rotating magnetic field speed, D Relative speed between stator and rotor, 11 What is the name of the starter symbol?, , A, B, C, D, , D.O.L starter, Auto transformer starter, Automatic star/delta starter, Semi automatic star/delta starter, , 12 What is the name of the starter symbol?, , A, B, C, D, , Star delta starter, Rheostatic starter, Direct on-line starter, Autotransformer starter, , A, B, C, D, , Universal motor, Permanent capacitor motor, Capacitor start induction run motor, Capacitor start capacitor run motor, , 16, A, B, C, D, , Which is the application of universal motor?, Jet pump, Food mixer, Teleprinter, Compressor, , 17 Which single phase motor is fitted with, wound rotor?, A Repulsion motors, B Shaded pole motors, C Permanent capacitor motors, D Capacitor start capacitor run motors, 18 Which type of single phase induction motor, is used in food mixer?, A Universal motor, B Repulsion motor, C Shaded pole motor, D Permanent capacitor motor, , - NIMI Question Bank -, , Page2/ 10

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19, A, B, C, D, , Which motor is used in table fan?, Universal motor, Shaded pole motor, Eddy current motor, Permanent capacitor motor, , - NIMI Question Bank -, , Page3/ 10

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8, , Questions: Level 2, 1, , A, B, C, D, 2, , A, B, C, D, 3, , A, B, C, D, 4, A, B, C, D, 5, , A, B, C, D, 6, A, B, C, D, 7, A, B, C, D, , What is the synchronous speed of a A.C 3, phase induction motor having 6 poles at a, frequency of 50 Hertz?, 800 rpm, 1000 rpm, 1200 rpm, 1440 rpm, Calculate the percentage slip in a 3 phase, induction motor having 6 poles with a, frequency of 50 Hertz rotating with actual, speed of 960 rpm?, 2%, 3%, 4%, 5%, What is the rotor frequency of a 3 phase, squirrel cage induction motor at the time of, starting?, Equal to supply frequency, 3 times less than supply frequency, 3 times more than supply frequency, times less than supply frequency, How the voltage is received in the rotor of, induction motor?, Direct connection from stator, Due to back emf produced in stator, Direct connection to rotor from supply, By the transformer action of stator and rotor, Which method is applied to control the speed, of 3 phase squirrel cage induction motor, from its rotor side?, Cascade operation, Changing applied voltage, Changing applied frequency, Changing the number of poles, Which loss of 3 phase induction motor is, determined by blocked rotor test?, Copper loss, Friction loss, Hysteresis loss, Eddy current loss, What is the purpose of using thermal cutout, in addition to fuse in A.C motor circuit?, Protect from heavy load, Protect against high voltage, Allow for continuous over loading, Protect against dead short circuit, , A, B, C, D, 9, A, B, C, D, , Which motor is used to provide high starting, torque at variable speed?, Universal motor, Permanent capacitor motor, 3 Phase slip ring induction motor, 3 Phase single squirrel cage induction motor, What is the relation between torque and slip, in an A.C induction motor?, Slip increases torque decreases, Slip increases torque increases, Slip decreases torque increases, Slip decreases torque decreases, , 10 Why the rotor bars are mounted in a slightly, skewed position in 3 phase motor?, , A, B, C, D, , Generate maximum flux, Reduce the stray losses, Maintain the rotor speed constant, Produce more uniform rotor field and torque, , 11 Which loss is determined by no load test of 3, phase induction motor?, A Iron loss, B Copper loss, C Friction loss, D Windage loss, 12 Which method of speed control two variable, speeds only obtained in 3 phase motor?, A By rotor rheostat control, B By changing applied frequency, C By changing the applied voltage, D By changing the number of stator poles, 13 Why slip ring induction motor is fitted with, wound rotor?, A To reduce the slip, B To control the speed, C To reduce the losses, D To get high starting and running torque, 14 What is the function of timer in automatic star, delta starter?, A Trip at over load, B Switch ON at pre set time, C Change from star to delta, D Switch OFF at pre set time, , - NIMI Question Bank -, , Page4/ 10

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15 Which instrument is used to measure, insulation resistance of a 3 phase induction, motor?, A Megger, B Multimeter, C Shunt type ohmmeter, D Series type ohmmeter, , 22 Determine the torque in newton metres, produced by a 7.5 HP squirrel cage motor, rotating at 1440 rpm?, A 21.63 Nm, B 24.4 Nm, C 33.05 Nm, D 36.6 Nm, , 16 What is the starting current of an A.C 3, phase induction motor?, A 1 to 2 times of full load current, B 2 to 3 times of full load current, C 4 to 5 times of full load current, D 5 to 6 times of full load current, , 23 Which type of handle design of rotary switch, is illustrated?, , 17 Which method is used to control the speed of, 3 phase induction motor from stator side?, A By cascade operation, B By rotor rheostat control, C By injecting emf in rotor circuit, D By changing the applied frequency, 18 What is the speed control method of 3 phase, induction motor?, , A, B, C, D, 24, , A, B, C, D, A, B, C, D, 19, , A, B, C, D, , Cascade operation method, Rotor rheostat control method, Changing applied voltage method, Injecting emf in rotor circuit method, What are the two functional circuits, incorporated with a three phase motor, starter?, Open circuit and short circuit, Closed circuit and open circuit, Short circuit and closed circuits, Control circuit and power circuit, , 20 Which type of starter is used to start and run, the 3 phase slip ring induction motor?, A Direct on-line starter, B Rotor rheostat starter, C Auto transformer starter, D Manual star-delta starter, 21, A, B, C, D, , Where the panel boards are used?, Industrial motor drives, Single phase domestic wiring circuits, 3 phase domestic wiring, Load distribution for AC & DC supply, , Knob, Lever, Coin slot, Key operation, What is the purpose of using rotor resistance, starter to start 3 phase slip ring induction, motor?, Reduce rotor voltage, Reduce rotor current, Increase the torque, Reduce the power loss, , 25 Which method of speed control is only, applicable for 3 phase slipring induction, motor?, A Cascade operation method, B Rotor rheostat speed control, C Changing the applied frequency method, D Changing the number of stator poles method, 26 Which type of A.C single phase motor is, classified under commutator motor type?, A Stepper motor, B Repulsion motor, C Shaded pole motor, D Permanent capacitor motor, 27 Which method is adopted to start the single, phase induction motor?, A Split phase method, B Varying supply voltage method, C Reversal of input supply terminals, D Reversal of running coil connection, , - NIMI Question Bank -, , Page5/ 10

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28 What is the type of A.C single phase motor?, , A, B, C, D, , Permanent capacitor motor, Capacitor start capacitor run motor, Induction start induction run motor, Capacitor start induction run motor, , 29 What is the purpose of the capacitor (C) in, centrifugal switch speed control method of, universal motor?, , A, B, C, D, , Maintain constant speed, Improve the power factor, Protect from the over loading, Reduce the sparks on the contacts, , 30 Which type of AC single phase motor having, low starting torque?, A Induction start induction run motor, B Capacitor start induction run motor, C Capacitor start capacitor run motor, D Resistance start induction run motor, 31 What is the function of centrifugal switch in, single phase motors?, A Maintain constant speed, B Break the starting winding, C Break the running winding, D Protect the motor from over loading, 32 What is the relation between running winding, and starting winding of a single phase, induction motor with respect to resistance?, A Both resistances will be equal, B Running winding is less, starting winding, more, C Running winding is more, starting winding, less, D Running winding is less, starting winding, , 33 What is the function of the part marked ‘x’ in, shaded pole motor?, , A, B, C, D, , Increase the efficiency, Maintain constant speed, Initiate the rotor movement, Strengthen the magnetic field, , 34 How the direction of rotation of a capacitor, start induction run motor is reversed?, A By changing the supply terminals, B By changing the capacitor connections, C By interchanging main winding terminals, D By interchanging both main and auxiliary, winding terminals, 35 Which single phase motor tapped field speed, control method is employed?, A Universal motor, B Shaded pole motor, C Capacitor start induction run motor, D Capacitor start capacitor run motor, 36 What is the angular displacement between, starting and running winding of a single, phase induction motor?, A 45 electrical degree, B 60 electrical degree, C 90 electrical degree, D 120 electrical degree, 37 Why the hysteresis motor is suitable for, sound recording instruments?, A Small in size, B High efficiency, C Noiseless operation, D Less error operation, 38 Which motor is preferred for domestic water, pumps?, A Universal Motor, B Repulsion motor, C Shaded pole motor, D Capacitor start motor, , - NIMI Question Bank -, , Page6/ 10

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39 How to produce starting torque in a shaded, pole fan motor?, A Using rings on poles, B Using capacitor on winding circuits, C Interchanging cage rotor windings by switch, D Interchanging the field coil windings by, switch, 40 What is the reason to use a permanent, capacitor in fan motor circuit?, A Speed regulation, B Lower power consumption, C Splitting of phase for torque, D Controlling electrical interference, 41 Why running winding is placed in the bottom, of the core?, A To get low resistance, B To get low inductance, C To get high resistance, D To get high inductance, 42 What is the application of shaded pole, motor?, A Hair dryer, B Ceiling fan, C Wet grinder, D Washing machine, 43 Which type of single phase motor is used for, hard disk drives?, A Stepper motor, B Repulsion motor, C Hysteresis motor, D Reluctance motor, , 46 What is the effect of A.C induction motor if, rotor bar is open circuited?, A Vibration of shaft, B Motor will not start, C Runs in slow speed, D Over heating of motor, 47 Which type of AC induction motor is used in, textile mills ?, A Slip ring induction motor, B Deepcut bar induction motor, C Single squirrel cage induction motor, D Double squirrel cage induction motor, 48 Which type of motor takes higher starting, current and works at low power factor?, A Repulsion motor, B Permanent capacitor motor, C Induction start, induction run motor, D Capacitor start, capacitor run motor, 49 Which type of motor is used for fax, machines?, A Stepper motor, B Universal motor, C Repulsion motor, D Hysteresis motor, 50 Which single phase motor has higher power, factor?, A Universal motor, B Split phase motor, C Shaded pole motor, D Capacitor start induction run motor, , 44 What is the function of centrifugal switch, used in capacitor start, capacitor run, induction motor?, A Disconnect the running winding after, reached 75% to 80% speed, B Disconnect the starting winding after reached, 75% to 80% speed, C Disconnect the starting capacitor after, reached 75% to 80% speed, D Disconnect the starting and running winding, after reached 75% to 80% speed, 45 Which type of single phase motor is having, very high starting torque than any other type, of single phase motor?, A Universal motor, B Reluctance motor, C Repulsion start induction run motor, D Capacitor start induction run motor, , - NIMI Question Bank -, , Page7/ 10

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8, , Questions: Level 3, 1, , A, B, C, D, 2, , A, B, C, D, 3, , A, B, C, D, 4, A, B, C, D, 5, A, B, C, D, 6, A, B, C, D, 7, , A, B, C, D, , Why external resistance is included in the, rotor circuit at starting through 3 phase, slipring induction motor starter?, To get high running torque, To get high starting torque, To reduce the load current, To get increased speed at starting, , A, B, C, D, 9, A, B, C, D, , What is the effect of open circuit in rotor of, an induction motor?, Motor does not start, Over heating in motor, Excess vibration of shaft, Motor runs with very low speed, What is the reason for frequent blowing of, fuse after motor running some time?, Improper earthing, Over loading of motor, Heavy voltage fluctuation, Poor insulation in winding, , What is the effect of motor, if the rotor, windings in slipring induction motor is open, circuited at starting?, Will not run, Runs at slow speed, Runs at very high speed, Runs but not able to pull load, What is the effect on 3 phase induction, motor if one phase is cut-off during running, with load?, Motor stops at once, Motor will run normally, Motor runs with humming noise with slow, speed, Motor will run slow speed but winding will be, burnt out shortly, , 11 Which is the cause for the 3 phase motor, starter with single phase preventer trips, frequently?, A Incorrect fuse ratings, B Unbalanced line voltages, C Incorrect settings of OLR, D Improper phase sequence, , What is the defect if starter with single, phasing preventer does not switch ‘ON’?, Improper phase sequence, Fluctuations in line voltage, Loose contact in supply lines, Wrong terminal connections at motor, , 12 Where the capacitor is connected in a single, phase permanent capacitor motor?, A In series with starting winding, B In series with running winding, C In parallel with starting winding, D In parallel with running winding, , What is the defect in AC 3 phase induction, motor runs at low speed if loaded?, Wrong motor connection, Wrong starter connection, Open circuit in rotor winding, Partially shorted in stator winding, , 13 What is the effect in a repulsion motor, if the, magnetic axis shifted to another side?, , 10 What happens to a 3 phase induction motor,, if one phase fails during starting?, A Motor runs and stop immediately, B Motor runs in slow speed continuously, C Motor runs and draws more current, D Motor continues to run with irregular speed, , Which fault condition thermal overload relay, protects A.C induction motor?, Short circuit, Open circuit, Over current, Under voltage, What happens to the rotor of a 3 phase, induction motor if its speed attains to, synchronous speed?, Rotor speed reduces, Rotor speed increases, Rotor speed remains same, Rotor bars get damaged, , A, B, C, D, , Direction of rotation will change, Direction of rotation remains same, Motor speed increases from rated speed, Motor speed will reduce from rated speed, , - NIMI Question Bank -, , Page8/ 10

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14 What is the effect if the centrifugal switch is, not disconnected after the motor starts?, A Motor will run normally, B Motor will stop immediately, C Starting winding will burn out, D Motor will run very slow speed, , 19 What is the defect while a 3 phase motor, over heated if loaded?, A Loose rotor bars, B Defective bearing, C Short in stator winding, D Wrong terminal connections, , 15 How the direction of rotation of repulsion, motors is to be reversed?, A By shifting the brush-axis, B By interchanging the supply terminals, C By changing the main winding terminals, D By changing the compensating winding, terminals, , 20 Why high contact resistance is provided at, brushes in universal motor?, A To increase the torque, B To increase the efficiency, C To reduce sparking at brushes, D To reduce the armature current, , 16 How the radio interference can be, suppressed in centrifugal switch method of, speed control of universal motor?, A By connecting capacitor across centrifugal, switch, B By connecting capacitor in series with, centrifugal switch, C By adding compensating winding with, armature, D By connecting an inductor in series with, centrifugal switch, 17 What is the reason if the handle of the, Star/Delta starter shown in the figure does, not hold at delta position?, , A, B, C, D, , 21 Which is the cause for the universal motor, fails to start?, A Tight bearing, B Insufficient current, C Incorrect grading of brush, D Open circuited field or armature, 22 How the good working capacitor can be, identified when it is tested by ohm meter?, A The needle deflects to centre position, B The needle will be in zero position but will, not go to infinity side, C The needle will not go to zero position and, remains in infinity side, D The needle deflects towards zero and then, move towards infinity slowly, , hold on coil circuit is open at delta position, hold on coil circuit will not get the potential, difference in delta, motor terminal connection at delta position is, not correct, connection is such that the hold on coil, circuit will function at star but not in delta., , 18 Calculate the speed of a 4.4 KV 6 pole, alternator running at 1200 rpm supplies, energy to an induction motor which has 4, poles at 2 % slip?, A 1470 I/min (rpm), B 1500 I/min (rpm), C 1764 I/min (rpm), D 1800 I/min (rpm), , - NIMI Question Bank -, , Page9/ 10

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Module 1 : Three Phase and Single Phase Induction Motor, - Key paper, Questions: Level 1, , Questions: Level 2, , Question: Level 3, , SL.No, , Key, , SL.No, , Key, , SL.No, , Key, , SL.No, , Key, , 1, , A, , 1, , B, , 34, , C, , 1, , B, , 2, , A, , 2, , C, , 35, , A, , 2, , A, , 3, , B, , 3, , A, , 36, , C, , 3, , D, , 4, , A, , 4, , D, , 37, , C, , 4, , A, , 5, , C, , 5, , A, , 38, , D, , 5, , D, , 6, , C, , 6, , A, , 39, , A, , 6, , C, , 7, , A, , 7, , C, , 40, , C, , 7, , D, , 8, , B, , 8, , C, , 41, , D, , 8, , D, , 9, , D, , 9, , B, , 42, , A, , 9, , D, , 10, , C, , 10, , D, , 43, , A, , 10, , A, , 11, , B, , 11, , A, , 44, , C, , 11, , C, , 12, , A, , 12, , D, , 45, , A, , 12, , A, , 13, , A, , 13, , D, , 46, , D, , 13, , A, , 14, , A, , 14, , C, , C, , D, , 15, , A, , D, C, , 14, , 15, , 47, 48, , 15, , A, , D, , 49, , D, , 16, , A, , 50, , D, , 17, , A, , 16, , B, , 16, , 17, , A, , 17, , D, , 18, , A, , 18, , A, , 18, , C, , 19, , D, , 19, , D, , 19, , A, , 20, , B, , 20, , C, , 21, , C, , 21, , D, , 22, , D, , 22, , D, , 23, , C, , 24, , C, , 25, , B, , 26, , B, , 27, , A, , 28, , D, , 29, , D, , 30, , D, , 31, , B, , 32, , B, , 33, , C, , - NIMI Question Bank -, , Page10/ 10

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Electrician - Semester II - CITS Module 2: Alternators and Synchronous Motor, Questions: Level 1, 1, A, B, , Which formula is used to calculate, EMF/phase E in a ideal alternator?, φFT, E=, 2.22, φFT, E=, 4.44, , C, D, , E = 2.22 ɸ FT, E = 4.44 ɸ FT, , 2, A, B, C, D, , Which rule is used to find the direction of, induced emf in an alternator?, Cork screw rule, Right hand palm rule, Fleming’s left hand rule, Fleming’s right hand rule, , 3, , What is the name of the part of alternator?, , A, B, C, D, , Stator, Exciter, Salient pole rotor, Smooth cylindrical rotor, , 4, , A, B, C, D, , What is the formula to calculate emf, equation of an alternator considering Kc and, Kd?, E = 4.44 Kd KcT φ, E = 2.22 Kd Kc Fφ, E = 4.44 Kd Kc FφmT, E = 1.11 Kd Kc Fφ, , 5, A, B, C, D, , How alternators are rated?, KVA, KW, MW, KV, , 6, , Which formula is used to calculate the, percentage voltage regulation (VR) in, alternator?, , A, , % VR =, , VFL − VNL, ×100, VFL, , B, , % VR =, , VNL − VFL, ×100, VFL, , C, , % VR =, , VNL − VFL, ×100, VNL, , D, , % VR =, , VFL − VNL, ×100, VNL, , 7, A, B, C, D, , What is the supply frequency of an, alternator having 6 poles runs at 1000 rpm?, 25 Hz, 40 Hz, 50 Hz, 60 Hz, , 8, , What is the name of the converter?, , A, B, C, D, , Metal rectifiers, Rotary convertor, Mercury arc rectifiers, Motor-Generator set, , 9, , Which 3 phase motor can be started only, with pony motor?, Synchronous motor, Squirrel cage induction motor, Wound rotor motor, Double cage motor., , A, B, C, D, , - NIMI Question Bank -, , Page1/ 9

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10, A, B, C, D, 11, , A, B, C, D, 12, , A, B, C, D, 13, A, B, C, D, 14, , A, B, C, D, , What is the working principle of an, alternator?, Self induction, Mutual induction, Electro - magnetic induction, Electro - static, , 16, , How many slip rings are in the 3 phase star, connected stationary armature type, alternator?, 1, 2, 3, 4, , A, B, C, D, 17, A, B, C, D, , What is the term used to state the order in, which the 3 phase voltage reach their, maximum value?, Phase sequence, Wave form, Phase displacement, Angular displacement, Which part is used to collect the alternating, current from the armature of an alternator?, Slip ring, Commutator, Stator terminals, Armature terminals, , What is the angle difference between any, two armature of 3 phase delta connected, alternator?, 90°, 120°, 150°, 180°, What is the wave form of output voltage of, an rotating field type alternator?, Sine wave, Square wave, Triangular wave, Saw - tooth wave, Which instrument used to find the instant of, closing the switch which connects the, alternators in parallel?, Techo meter, Phase sequence, Telescope, Sychroscope, , 15, , What is the name if the part of an, alternator?, , A, B, C, D, , Double cage rotor, Projecting pole rotor, Salient pole rotor, Smooth cylindrical rotor, , - NIMI Question Bank -, , Page2/ 9

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8, , Questions: Level 2, 1, A, B, C, D, , Calculate the speed of an alternator having, 2 poles at a frequency of 50 Hz?, 1500 rpm, 2500 rpm, 3000 rpm, 6000 rpm, , A, B, C, D, , What condition the lamps become dark in, dark lamp method of parallel operation of, two alternators?, Terminal voltages are equal, Voltage and frequency are equal, Voltage and power rating are equal, Frequency are same in both alternator, , 3, A, B, C, D, , What is the use of synchroscope?, Adjust the output voltage, Adjust the phase sequence, Adjust the supply frequency, Indicate the correct instant for paralleling, , 4, , What is the name of the equipment that, provides D.C to the rotor of alternator?, Exciter, Inverter, Converter, Synchroniser, , 2, , A, B, C, D, 5, A, B, C, D, 6, A, B, C, D, 7, , A, B, C, D, , What is the purpose of damper winding in, alternator?, Reduces the copper loss, Reduces windage losses, Reduces the hunting effect, Improves the voltage regulation, Which condition is to be satisfied before, parallel operation of alternators?, Rating must be same, Phase sequence must be same, Rotor impedance must be same, Stator impedance must be same, What is the speed of an alternator, connected with a supply frequency of 50 Hz, at rated voltage having 4 poles?, 1000 rpm, 1500 rpm, 3000 rpm, 4500 rpm, , A, B, C, D, , What condition the two lamps become bright, and one lamp dark during paralleling of two, alternators?, Terminal voltages are equal, Voltages and frequencies are equal, Voltages and phase sequence are equal, Both the alternators receive same frequency, , A, B, C, D, , What causes the terminal voltage of an, alternator reduces, if the load increases?, Field resistance, Armature reaction, Inductive reactance, Armature resistance, , 10, , What is the type of alternator?, , A, B, C, D, , Brushless alternator, Three phase alternator, Single phase alternator, Salient pole type alternator, , 11, , Calculate the speed in r.p.s of the 2 pole,, 50Hz alternator?, 50 rps, 100 rps, 1500 rps, 3000 rps, , 9, , A, B, C, D, 12, A, B, C, D, 13, A, B, C, D, , What is the advantage of using rotating field, type alternator?, Easy to locate the faults in the field, Easy to connect the load with alternator, Easy to dissipate the heat during running, Two slip rings only required irrespective of, No. of phases, What is the effect in increasing the field, excitation current in alternator?, Prevents demagnetising, Over voltage protection, Dead short circuit protection, Alternator will be over loaded, , - NIMI Question Bank -, , Page3/ 9

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A, B, C, D, , Why D.C supply is necessary for, synchronous motor operation?, Reduce the losses, Start the motor initially, Run the motor with over load, Run the motor at synchronous speed, , 15, A, B, C, D, , Which acts as both inverter and converter?, Metal rectifier, Mercury arc rectifier, Semi conductor diode, Synchronous converter, , 16, , Why exciter is essential to run a, synchronous motor?, Carry more load in motor, Improve the power factor, Reduce the losses in motor, Run the motor at synchronous speed, , 14, , A, B, C, D, 17, A, B, C, D, 18, A, B, C, D, 19, , 20, A, B, C, D, 21, , A, B, C, D, 22, , A, B, C, D, 23, , Which is the main application of, synchronous motors?, Elevators, Paper rolling mills, AC to DC converter, Power factor correction device, What is the advantage of motor generator, set?, Noiseless, High efficiency, Low maintenance required, DC output voltage can be easily controlled, What is the function of the part marked ‘X’ of, the rotary converter?, , A, B, C, D, 24, A, B, C, D, 25, A, , A, B, C, D, , Converts AC to DC, Reduces voltage drop, Helps to deliver without noise, Collects the delivered direct current, , B, C, D, , Which characteristic is applicable to, synchronous motors?, Runs at variable speed at all loads, Suitable to supply only electrical load, Can not be used for PF improvement, Not self starting, How the generated AC is connected to the, load in a stationary magnetic field type, alternator?, Through split rings, Directly through terminal connection, Through commutator, Through slip rings, Which method is easy to check the phase, relation of both alternators during parallel, operation?, Using all dark lamp method, Using a synchroscope, Checking by a phase sequence indicator, Checking by bright and dark lamp method, What factor the amount induced emf, depends upon?, Number of poles of alternator, Change of speed of alternator, Rate of change of flux linkage, Direction of rotation of the alternator, How the salient pole rotor could be, identified?, By its larger diameter and longer axial, length, By its larger diameter and shorter axial, length, By its shorter diameter and larger axial, length, By its shorter diameter and shorter axial, length, How the smooth cyclindrical type rotor could, be identified?, By its larger diameter and longer axial, length, By its larger diameter and shorter axial, length, By its shorter diameter and larger axial, length, By its shorter diameter and shorter axial, length, , - NIMI Question Bank -, , Page4/ 9

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26, A, B, C, D, 27, , Where the damper winding is palced in an, alternator?, In the pole shoe, In the armature, In the shaft, In the exciter, Which test of alternator is illustrated in this, circuit?, , A, B, C, D, , Continuity test between armature windings, Continuity test between field windings, Earth test between winding and body, Insulation resistance test between armature, and field windings, , 28, , Which test of alternator is illustrated in this, circuit?, , 31, A, B, C, D, , A, B, C, D, , What is the draw back of open type, armature slots?, Difficult for placing form wound coils, Not easy to remove and replace the coils, Uneven distribution of the magnetic flux, Uneven air gap between stator and rotor, , 33, A, B, C, D, , Why alternator is rated in KVA?, Output KW is proportional to power factor, It consumes apparent power, Power consumed is in KVA, To consider reactive power, , 34, , What is the purpose of earthing neutral, conductor in alternators?, To reduce the power losses, To protect the operators from shock, To maintain proper voltage in the system, To bring down the leakage potential to zero, , 32, , A, B, C, D, 35, , A, B, C, D, , Continuity test field armature windings, Insulation test between armature and body, Insulation test between armature and field, Insulation test between field and body, , 29, , How many cycles will be completed, if a coil, of a 4 pole alternator under goes one, revolution?, 1, 2, 3, 4, , A, B, C, D, 30, A, B, C, D, , What is the disadvantage in salient pole, type rotor?, Having move space for field, Having diffcult to obtain mechanical, balancing, Having more space for heat dissipation, Having projecting field poles, , A, B, C, D, 36, A, B, C, D, , Which loss is eliminated by using laminated, steel cores in armature of an alternator?, Copper loss, Windage loss, Hysteresis loss, Eddy current loss, What is the function of damper windings in, synchronous motor?, Maintain power factor, Excite the field winding, Maintain constant speed, Start the synchronous motor, , Which instrument used to check the phase, sequence of alternators?, Synchroscope, Phase sequence meter, Techo meter, Frequency meter, , - NIMI Question Bank -, , Page5/ 9

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7, , Questions: Level 3, 1, , A, B, C, D, 2, A, B, C, D, 3, A, B, C, D, 4, , A, B, C, D, 5, A, B, C, D, 6, A, B, C, D, , Calculate the pitch factor (KP) for a winding, having 36 stator slots 4 pole with angle (α), is 30° in alternator?, 0.942, 0.965, 0.978, 0.985, , A, B, C, D, , What is the cause for hunting effect in, alternators?, Due to over load, Running without load, Running with fluctuation of speed, Due to continuous fluctuation in load, , A, B, C, D, , 8, , 9, , How to compensate de-magnetizing effect, due to armature reaction in an alternator?, By reducing the speed of alternator, By increasing the speed of alternator, By increasing the field excitation current, By decreasing the field excitation current, Calculate the voltage regulation in, percentage if the load is removed from an, alternator, the voltage rises from 480V to, 660V?, 27.20%, 32.50%, 37.50%, 38.50%, Why the synchronous motor fails to run at, synchronous speed?, In sufficient excitation, Defective pony motor, Open in damper winding, Short in damper winding, How the synchronous motor is used as a, synchronous condenser?, Varying the motor load, Varying the rotor excitation, Varying stator voltage in motor, Varying stator current in motor, , A, B, C, D, 10, A, B, C, D, 11, A, B, C, D, , How synchronous motor works as a power, factor corrector?, Varying the line voltage, Varying the field excitation, Increasing the speed of motor, Decreasing the speed of motor, Which is the cause for the lamps are dark at, different timings , during synchronising of, alternator?, Frequency, Speed, Phase sequence, Voltage, Calculate the distribution factor (Kd) of single, phase alternator has the winding housed in, 3 slots per pole and the slots in groups of, three being 20° apart?, 0.85, 0.92, 0.94, 0.96, How the frequency of incoming alternator, can be changed?, By changing the level of excitation, By changing the speed of prime mover, By changing the direction of excitation, By interchanging any two terminals of, alternator, How the phase sequence of the incoming, alternator can be changed?, By adjusting the speed of alternator, By changing level of excitation, By adjusting the fuel inlet level of prime, move, By interchanging any two terminals of, alternator, , - NIMI Question Bank -, , Page6/ 9

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12, , What is the defect, if the megger reads zero, mega Ohm?, , 16, , A, B, C, D, 17, A, B, C, D, 13, , Short circuit between armature windings, Short circuit between armature and field, winding, Earth fault between armature winding and, body, Earth fault between field winding and, What is the defect, if the megger reads zero, mega Ohm?, , A, B, C, D, 18, A, B, C, D, 19, , A, B, C, D, 14, A, B, C, D, 15, , A, B, C, D, , Short circuit between the armature windings, Short circuit between the armature and field, winding, Earth fault between field winding and frame, Earth fault between armature winding and, frame, Which load, the terminal voltage of an, alternator will slightly fall?, Resistive, Inductive, Dielectric furnace, Induction furnace, What happens If phase sequence of two, alternators are not same, while parallel, operation?, Work, but with less power, Short circuit, Voltage fluctuates, Incoming machine acts as motor, , A, B, C, D, 20, A, B, C, D, 21, , A, B, C, D, , Calculate pitch factor for a winding having, 36 stator slots, 4 poles with coil span of 1 to, 10?, 0.94, 1, 0.87, 98, What is the reason if the alternator is initally, loaded with resistive load , the voltage, decreases but the voltage is increased after, further loading?, The winding heat increased, Higher flux in armature, Due to automatic voltage regulator, Prime mover input reduced, How the additional load can be added to the, alternator?, Increase excitation voltage, Increse power input to prime mover, Increase load power, factor, Increase excitation current, When the minimum armature current is, drawn in synchronous motor?, At normal excitation, With over excitation, With under excitation, Above normal excitation, What happens when synchronous motor is, loaded beyond pull out troque?, Motor will stop, Motor will run with less speed, Motor speed fluctuated, Runs as generator, How much load current will be supplied by a, 400V, 3 phase alternator to 1.73KW lamp, load?, 4.32 A, 2.5 A, 2.3 A, 4.5 A, , - NIMI Question Bank -, , Page7/ 9

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22, A, B, C, D, 23, A, B, C, D, , Which is used to prevent the hunting effect, in alternator?, Compensating winding, Stator winding, Damper winding, Rotor winding, How to compensate de-magnetizing effect, due to armature reaction in an alternator?, Reducing the speed of alternator, Reducing field excitation current, Increasing field excitation current, Increasing the speed of alternator, , - NIMI Question Bank -, , Page8/ 9

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Module 2: Alternators and Synchronous Motor, - Key paper, Questions: Level 1, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, , Key, , D, D, C, D, A, B, C, B, A, C, B, B, A, D, D, A, A, , Questions: Level 2, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, , Key, , C, B, D, A, C, B, B, B, D, A, A, D, A, D, D, D, D, D, D, D, D, C, C, B, C, A, D, D, B, B, B, C, A, C, D, D, , - NIMI Question Bank -, , Question: Level 3, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, , Key, , B, D, C, C, A, B, B, C, D, B, D, B, C, A, B, A, C, B, A, A, B, C, C, , Page9/ 9

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Electrician CITS - Semester- II, Module 3: Small Transformer and DC Machine Winding, Questions: Level 1, 1, A, B, C, D, , Which instrument is used to measure, armature winding resistance?, Megger, Multimeter, Series type Ohm meter, Kelvin bridge, , 2, A, B, C, D, , Which winding wire is used for DC field coil?, Super enameled copper wire, Single silk covered copper wire, Double silk covered copper wire, PVC covered copper winding wire, , 3, , A, B, C, D, , How many parallel paths in duplex lap, winding in the armature of 4 pole D.C, Motor?, 2, 4, 6, 8, , 4, , What is the name of the equipment?, , A, B, C, D, , Megger, Earth resistance tester, Internal growler, External growler, , 5, , What is the name of winding, if coil pitch is, less than pole pitch?, Full pitch winding, Half pitch winding, Long chorded winding, Short chorded winding, , A, B, C, D, , 6, , Identify the number of poles in the winding ?, , A, B, C, D, , 2, 4, 6, 8, , 7, , Which part of the core is to be referred to, calculate cross section area ?, , A, B, C, D, , Centre limb, Yoke, Any one of outer limb, Window, , 8, A, B, C, D, , Which term refers the winding ?, Resistance, Capacitance, Inductance, Permeability, , 9, , What is the name of the winding . If the end, is not overlaped each other?, Flat loop winding, Concentric winding, Diamond coil winding, Chain winding, , A, B, C, D, , - NIMI Question Bank -, , Page1/ 7

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Questions: Level 2, 1, A, B, C, D, 2, A, B, C, D, 3, A, B, C, D, 4, , Which insulating material belongs to class, ‘B’ insulation?, Cotton, Bamboo, Fibre glass, Leatheroid paper, What is the temperature value of class ‘F’, insulation?, 90°C, 105°C, 120°C, 155°C, Which is the most effective method of, balancing armature?, Static balancing, Dynamic balancing, Attached with counter balancing, Plugged with lead weight balancing, , 6, A, B, C, D, , What is the purpose of tapes in winding?, Insulate slots, Bind the coils, Wrap the conductor, Insulate exposed conductors, , 8, , Which type of DC armature winding the front, pitch (YF) is greater than back pitch (YB)?, Lap winding, Wave winding, Progressive winding, Retrogressive winding, , A, B, C, D, 9, A, B, C, D, , How to obtain opposite polarity in adjacent, poles into a 4 pole DC motor?, Varying the number of turns in coil, Making series connection of coils, Making parallel connection of coils, Making current flow in different direction, , 10 What is the operation in the rewinding, process?, , Which type of armature winding is, illustrated?, , A, B, C, D, A, B, C, D, , Duplex lap winding, Triplex lap winding, Simplex lap winding, Quadruplex lap winding, , 5, , Which growler test for armature is, illustrated?, , A, B, C, D, , Open coil test, Ground coil test, Shorted coil test, Shorted commutator tests, , Cleaning of slots, Removing of winding, Removing of wedges, Cutting of winding wire, , 11 Which insulating material used in winding is, a highly non -hygroscopic and possess good, electrical strength?, A Empire cloth, B Triplex paper, C Millinex paper, D Leatheroid paper, , - NIMI Question Bank -, , Page2/ 7

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12, , Which type of armature winding is, illustrated?, , 16 Which type of test for armature is, illustrated?, , A, B, C, D, , Triplex wave winding, Duplex wave winding, Progressive lap winding, Retrogressive lap winding, , A, B, C, , 13, , Calculate the average pitch (YA) for, retrogressive wave winding, if, No. of armature conductor = 14, No. of slots = 7, No. of poles = 2, 4, 6, 8, 14, , D, , A, B, C, D, 14, , A, B, C, D, , 17, A, B, C, D, , Which type of test is illustrated for the, armature after rewound?, , Test for shorted commutator., Test for grounded commutator., Insulation resistance test between, Commutator segments, Growler test for grounded Commutator, segments., Why the enamel coating is to be applied in, winding ?, It gives red colour appearance, It gives nice fragrance, It gives high insulation, It acts as heating elements, , 18 What is the purpose of Bamboo in, rewindings ?, A To keep extra coil, B Increase the size of the slot, C Prevents the coil from coming out during, operation, D Dummy slot making, 19 Which insulating material is used for, rewinding ?, A Leatheroid paper, B Rubber, C P.V.C, D Bakelite, , Open coil test, Shorted coil test, Voltage drop test, Grounded coil test, , 15 Why the newly rewound armature must be, preheated before varnishing?, A Drive out the moisture from it, B Help for quick drying of varnish, C Make easy to penetrate varnish inside, D Maintain uniform spreading of varnishing, , 20 Which refers Double layer winding?, A Each slot contains 3 coils sides, B Each slot contains 4 coils sides, C Each slot contains 2 coils sides, D Each slot contains one coils side, 21 Where the damper windings are placed in, motor?, A Bearing, B End closure, C Rotor, D Stator, , - NIMI Question Bank -, , Page3/ 7

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22 Which type of transformer, sandwiched type, of winding is used?, A In current transformer, B In core type transformer, C In shell type transformer, D In potential transistor, 23, A, B, C, D, , Which winding wire is used for transformer, having more cross sectional area ?, Copper winding, Steel winding, Aluminium winding, Iron winding, , 24 Which winding has more number of turns?, A Low voltage winding, B High voltage winding, C Centre tap winding, D Secondary winding, 25 Which part of transformer is mostly affected, from over heating?, A Iron core, B Copper winding, C Winding insulation, D Frame or Case, 26, A, B, C, D, , What is the coil span for 4 pole, 12 slot, armature winding?, 24, 48, 8, 3, , 29 Which type of lap winding is illustrated ?, , A, B, C, D, , Progressive lap winding, Duplex lap winding, Retrogressive lap winding, Triplex lap winding, , 29 Which type of lap winding is illustrated ?, , A, B, C, D, , Progressive lap winding, Duplex lap winding, Retrogressive lap winding, Triplex lap winding, , 30 What is the property of insulating material ?, A Withstand vibrations, B Conduct heavily, C Have low melting point, D Have moistures, , 27 How many commutator segments are in a 2, pole DC machine with coil span equal to 6 ?, A 3, B 12, C 4, D 8, 28 Which is used to test armature winding for, short and open circuit?, A Tong Tester, B Internal Growler, C External Growler, D Digital multimeter, , - NIMI Question Bank -, , Page4/ 7

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Questions : Level 3, , 6, , 1, , A, B, C, D, , Which winding fault is determined by the, test?, , 7, A, B, C, D, A, B, C, D, , Open coil fault, Short coil fault, Grounded coil fault, Grounded core fault, , 2, , What is the value if Y6 for simplex lap, winding with '4 Pole , 12 slot armature with, two coil side/ slot ?, 3, 5, 7, 9, , A, B, C, D, , What is the value of YF for a lap winding with, a 4 pole, 12 slot armature with two coil side/, slot - (Assume single tuens coil progressive winding)?, 3, 5, 7, 9, , A, B, C, D, , A, B, C, D, 3, , A, B, C, D, 4, , A, B, C, D, 5, , A, B, C, D, , 8, , How the unbalanced weight of wound, armature side can be identified by static, balancing method ?, It rolls without stopping on flat surface, It stops at particular position with sucessive, rolling, It stops initial position without rollin, It stops at different position in each rolling, What is the value of YF for a lap winding with, a 4 pole, 12 swt armature with two coil, sides/ slot - (Assume single tuens coil retrogressive winding)?, 9, 3, 11, 5, , 9, , What is the reading of voltmeter if the, winding is short, during voltage drop test?, Zero reading, Negative reading, Low voltage reading, High voltage reading, What is the type of DC armature winding, if, the coil sides are one pole pitch apart ?, Multiplex, Fractional pitch, Full pitch, Pole pitch, What is the spacing between the brushes for, a wave winding, if 6 pole armature with 16, slots having 2 coil sides per slot, 1 single, turn coil?, 4 segments, 8 segments, 16 segments, 12 segments, Calculate the current carried by a particular, brush in 2 pole machine when conductor, current is 4mA?, 16 mA, 8 mA, 2 mA, 10 mA, , 10 How many number of brushes required for, small and large machine respectively in, wave wound armature ?, A 2,2, B 4,2, C 2,4, D 4,4, 11, , A, B, C, D, , How many number of slots, if Spacing, between the brushes for a 4 pole m/c in, term of commutator segments in equal to 6, ?, 48, 3, 24, 6, , 12 Which part, the temperature rise will occur, maximum if a transformer is continuously, operated ?, A Core, B Winding, C Tank, D Conversation, , - NIMI Question Bank -, , Page5/ 7

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13 How many brushes are to be used in DC, machine if brushes are placed 4 commutator, segments apart for 16 commutator, segments?, A 8, B 12, C 2, D 4, , - NIMI Question Bank -, , Page6/ 7

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Module 3: Small Transformer and DC Machine Winding- Key paper, Questions: Level 1, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, , Key, , D, A, A, D, D, B, A, C, A, , Questions: Level 2, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, , Key, , C, D, B, A, A, C, D, D, C, C, C, B, B, A, B, C, C, A, C, C, C, A, B, C, D, B, C, C, A, A, , - NIMI Question Bank -, , Question: Level 3, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, , Key, , A, C, B, B, A, A, C, B, B, C, C, B, D, , Page7/ 7

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Electrician - Semester II - CITS - Module 4: AC Machine winding, Questions: Level 1, , 6, , Name the part marked ‘X’ of the winding, machine?, , A, B, C, D, , Mandrel, Wire feed, Wire guides, Spool carrier, , 7, , A, B, C, D, , What is the phase displacement between, windings in 3 phase motor?, 90°, 120°, 180°, 360°, , What is the electrical degree of 6 pole stator, motor?, 360°, 720°, 1080°, 1440°, , 4, , What is the name of AC winding?, , 8, , 1, A, B, C, D, 2, A, B, C, D, 3, , Which formula is used to calculate the total, electrical degree in stator of an A.C motor?, Total electrical degree = 180° / No. of slots, Total electrical degree = 180° x No. of slots, Total electrical degree = 180° / No. of poles, Total electrical degree = 180° x No. of poles, Which term represents the distance between, the two active sides of a coil?, Coil pitch, Coil group, Pole pitch, Pitch factor, , A, B, C, D, , Half coil winding, Whole coil winding, Single layer winding, Double layer winding, , 5, , What is the name of the coil winding?, , A, B, C, D, , A, B, C, D, , Calculate the number of coils per phase per, pair of poles of 3 phase motor having 2 pole,, 24 slots,12 coils?, 1, 2, 3, 4, , 9, , What is the formula to calculate pitch factor?, , A, , Pitch factor =, , Pole pitch, Winding pitch, , B, , Pitch factor =, , Winding pitch, Pole pitch, , C, , Pitch factor =, , Number of slots, Number of poles, , Number of poles, Number of slots, 10 How pole pitch is measured in terms of slots, in AC winding?, D, , A, B, C, D, , Concentric coil winding, Distributed coil winding, Mesh shaped coil winding, Diamond mesh shaped coil winding, , A, B, , Pitch factor =, , Total electrical degrees, Number of slots, Number of slots, Total electrical degrees, , C, , No of slots in the stator, No of poles, , D, , No of poles, No of slots in the stator, , - NIMI Question Bank -, , Page1/ 8

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11 What is the formula to calculate the mean, circumference of the coil?, L −L, A Lm = out in cm, 2, L in − L out, cm, 2, , B, , Lm =, , C, , Lm =, , 2, cm, L out − L in, , D, , Lm =, , 2, cm, L in − L out, , 12 Which winding wire is used for rewinding a, submersible motor?, A Super-enamelled copper wire, B Single silk covered copper wire, C PVC covered copper winding wire, D Double cotton covered copper wire, , 17 What are the two methods by which polarity, of field (poles) of a winding can be checked ?, A By Internal growler and External growler, B Magnetic compass and Search coil, C Magnetic compass and Internal growler, D Search coil and External growler, 18 Which winding is referred, if each slot, contains two coil sides in a 3 phase stator, winding?, A Balanced winding, B Single layer winding, C Un balanced winding, D Double layer winding, , 13 Which is used winding wire is used for, rewinding the armature of a mixer/Liquidizer, motor ?, A Single silk-covered copper wire, B Super enamelled copper wire, C Single cotton covered copper wire, D Double silk covered winding wire, 14 Which factor depends on total Electrical, degrees for a 3 phase winding?, A No. of slots, B No. of poles, C No. of coils, D No. of phases, 15 What is the name of winding ?, , A, B, C, D, , half coil winding, full pitch winding, whole coil winding, series winding., , 16 What is total electrical degrees of a 4 pole, AC machine ?, A 180°, B 360°, C 720°, D 1080°, , - NIMI Question Bank -, , Page2/ 8

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Questions: Level 2, 1, A, B, C, D, 2, A, B, C, D, 3, A, B, C, D, 4, A, B, C, D, 5, A, B, C, D, 6, A, B, C, D, , Why pre heating is necessary for motors, before varnishing in rewinding process?, To dry the varnish quickly in winding, To easy flow of varnish in the winding, To increase the insulation resistance value, To drive out the moisture in between winding, layers, Which type of test is conducted using, internal growler in AC motor winding?, Ground test, Polarity test, Continuity test, Short circuit test, Which device is used to test startor winding, short and open fault?, Tong Tester, Internal Growler, External Growler, Digital multimeter, Which type of wire is used for rewinding of, A.C 3 phase motors?, Super enamelled copper wire, PVC covered copper winding wire, Single cotton covered copper wire, Double cotton covered copper wire, Which material is used as wedges in, winding process?, Empire, Cotton, Bamboo, Terylene, Which test in winding is essential before, giving supply?, Ground test, Polarity test, Open circuit test, Short circuit test, , 7, , Which test of winding is illustrated?, , A, B, C, D, , Polarity test, Ground test, Continuity test, Short circuit test, , 8, , Which is the main property of leatheroid, paper insulation?, Non moisturized material, Highly non-hygroscopic, Very good for class F insulation, Better ageing and dielectric strength, , A, B, C, D, 9, A, B, C, D, , Which type of insulating material is selected, for binding the coils and over hangs?, Cotton sleeves, Empire sleeves, Terylene thread, Fibre glass tape, , 10 Which insulation is used for cuffing in AC, winding?, A Fibre glass tape, B Leatheroid paper, C Empire fiber glass tape, D Fabric based adhesive tape, 11, A, B, C, D, , Which refers coil in AC winding?, Number of turns connected in series, Number of turns connected in parallel, Number of turns under two similar poles, Number of turns under two dissimilar poles, , 12 Which type of AC winding the number of, coil/pole/phase is more than one at different, pitches?, A Involute coil winding, B Diamond coil winding, C Flat loop over lapped winding, D Flat loop non-over lapped winding, , - NIMI Question Bank -, , Page3/ 8

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13 Calculate the number of coils /phase/ pole, for a 3 phase double layer distributed, winding for a motor having 36 slots, 36 coils, and 4 poles?, A 3 coils /phase/ pole, B 6 coils / phase/pole, C 9 coils / phase/pole, D 12 coils/ phase/ pole, , 19 Where the space for cooling is provided for, winding coils in motor?, A Between overhanging coils, B Between overhanging coil and rotor, C Between overhanging coils and yoke, D Between overhanging coil and wedge, 20 Which type of the winding is illustrated?, , 14 What is the type of rewinding process?, , A, B, C, D, , A, B, C, D, , Hand winding, Drilling machine winding, Former winding, Machine winding, , 21 What is the name of 3 phase motor winding,, if the coil pitch is less than pole pitch?, A Full pitch winding, B Whole coil winding, C Long chorded winding, D Short chorded winding, , 15 Which operation to be carried out after, baking of varnish?, A Varnish stripping, B Painting of stator body, C Cleaning of stator body, D Assembling of stator and rotor, , 22 Which is the demerit of 3 phase concentric, winding?, A More space is required, B A stepped former is required, C More difficult to shape the coils uniformly, D It is not easy to make the end connection, , 16 What is the function of collar?, , A, B, C, D, , Skew winding, Skein winding, Involute coil winding, Diamond coil winding, , Provides insulation around field, Provides insulation for coil tapping, Helps tightening material for flange, Provides insulation for heat transfer from coil, , 17 What is the advantage of short pitch winding, of 3 phase induction motor?, A Easy for winding, B Running torque increases, C Efficiency of machine is increased, D Starting and running current reduces, , 23 Calculate the phase displacement in terms of, slots for a 3 phase, 36 slots, 12 coils, 4 pole, stator winding?, A 3 slots, B 4 slots, C 6 slots, D 8 slots, 24 Which type of AC motor winding having the, number of coil/pole/phase is more than one, arranged in different slots?, A Basket winding, B Concentric winding, C Distributed winding, D Concentrated winding, , 18 What is the reason of long chord winding is, avoided in AC motors?, A Low efficiency, B Low starting torque, C More winding wire required, D Control the increased heat loss, , - NIMI Question Bank -, , Page4/ 8

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25 Which type of testing of winding is, illustrated?, , A, B, C, D, , 31 Which type of varnish is used for AC 3 phase, squirrel cage induction motor after, rewinding?, A Baking varnishes, B Air-drying varnishes, C Solventless varnishes, D Thermo setting varnishes, , Polarity test, Resistance test, Short circuit test, Voltage drop test, , 32 Which test in an AC 3 phase stator winding, is illustrated?, , 26 Which is irrelevant feature of AC three phase, distributed winding?, A Number of coils / per pole must be equal, B Size of all the coils is same, C Pitch of all the coils is same, D It can be a single layer or double layer, 27 How the auxiliary and main winding are, placed in single phase motor winding?, A Auxiliary winding housed near the tip of slot, and main winding deep in the slot, B Main winding housed near the tip of slot and, auxiliary winding deep in the slot, C No fixed rule for placement of windings is, applicable, D Both the windings are placed deep inside the, slots to have proper phase displacement, , A, B, C, D, , Polarity test, Insulation resistance test, Open circuit test by growler, Short circuit test by internal growler, , 33 What is the maximum temperature the, winding is to be preheated before, varnishing?, A 40°C, B 60°C, C 90°C, D 140°C, , 28 How to connect the capacitor in the circuit for, testing and commissioning of table fan ?, A Series with auxiliary winding permanently, B Series with main winding permanently, C Parallel to the supply mains, D Series with starting winding at the time of, starting, , 34 Calculate the slot distance in angle for a, ceiling fan having 28 slots, 14 poles, 14 coils, in half coil connection?, A 90°, B 120°, C 180°, D 240°, , 29 Which is a function of insulating varnish, when applied on a newly wound motor?, A Will not allow the ingress of moisture., B Bonds the conductors together, C Works against the action of oil, acids,, alcalies, D Cools the winding by admiting free flow of air, , 35, A, B, C, D, , Which motor is having half coil winding?, Mixer, Grinder, Ceiling fan, Washing machine, , 30 Which factor decides the permissible, temperature rise of electrical machine?, A Material used for winding wire, B Wedges used for winding, C Insulating varnish used, D Insulating materials used for winding, , - NIMI Question Bank -, , Page5/ 8

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5, , Questions: Level 3, 1, , A, B, C, D, 2, , What indication denotes the shorted coil, defect in 3 phase motor stator winding while, testing with internal growler by keeping, hacksaw blade?, Hacksaw blade gets over heated, Rapid vibration of hacksaw blade, Hacksaw blade repels against the slots, Attracted by the winding turns on the slot, How the corresponding labeled A1,B2,C1, terminals ends are to be marked respectively, in other ends?, , A, B, C, D, 6, , A, B, C, D, 7, , A, B, C, D, 3, , A2 B1C2, A2 C2 B1, B1 A2 C2, C2 B1 A2, Which type of coils connection for the, developed winding diagram of a 28 slots 14, coils of a ceiling fan?, , A, B, C, D, 8, , A, B, C, D, A, B, C, D, , half coil connection for 28 poles, whole coil connection for 14 poles, whole coil connection for 28 poles, half coil connection for 14 poles, , 4, , Which end connection is correct for a 32, slots, 16 coils, 16 poles ceiling fan motor, winding in the figure?, , A, B, C, D, , 9, , 2-4, 3-5, 6-8, 7-9, 10-12, 11-13, 14-16, 15--MW2, 2-3, 4-5, 6-7, 8-9, 10-11, 12-13, 14-15, 16--MW2, 2-3, 4-8, 7-6, 5-9, 10-11, 12-16, 15-14, 13--MW2, 2-4, 3-6, 5-8, 7-10, 9-12, 11-14, 13-15, 16--MW2, , A, B, C, D, , What will happen if the overhang of the coil, is more in split phase motor winding?, The insertion of the coils will be easy, The insertion of the coils will be difficult, The coils may not allow the end cover to be, fitted, The coils may allow easily the end cover to, be fitted, How many coils are to be connected for both, starting and running winding if concentric, winding for a capacitor motor having 24 slots, 112 coils?, Starting 6, running 6 coils, Starting 4, running 8 coils, Starting 8, running 4 coils, Starting 2, running 10 coils, Calculate degree/ slot of a single phase, capacitor type table fan having no of pole 4., No of slots 8, and No of coils 8, 60°, 75°, 85°, 90°, Calculate the slot displacement between, main and starting winding for a single phase, capacitor type table fan having 4 poles and 4, coils., 1, 2, 3, 4, Calculate No of coil per pole for a single, phase capacitor type table fan 240v 50Hz, having 8 slots, 4 poles an No of coils 8., 1, 2, 3, 4, , 10 Why removing of heated damaged coils are, avoided in stripping the winding from starter?, A Not able to measure the size of winding wire, B To avoid damage to the lamination, C Not able to measure the coil size, D To avoid damage in body, , - NIMI Question Bank -, , Page6/ 8

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11 Calculate the number of coils for starting and, running winding for a ceiling fan number, slots - 28 no. of poles -14 if it is connected, for half coil connections?, A 4 coils for starting 10 coils for running, B 10 coils for starting 4 coils for running, C 8 coils for starting 6 coils for running, D 7 coils for starting and 7 coils for running, winding, , 17 What is effect of low graded insulating, materials are used for re winding of motors?, A Insulation resistance between conductor, decrease, B Insulation resistance between body and, conductor decreases, C Short circuit fault occurs, D Open circuit fault occurs, , 12 Calculate the pole pitch for a ceiling fan, if, number of slots 28 number of poles 14 and, number of coils 28?, A 2, B 4, C 6, D 8, , 18 What will happen, if the overhang of the coil, is less in size of a split phase motor winding, A The insertion of the coils will be easy, B The insertion of the coils will be difficult, C The coils allow easily the end cover to be, fitted, D The coils may not allow the end cover to be, fitted, , 13 Calculate the slot distance in terms of degree, for a ceiling fan having 28 slots, 14 poles, 14, coils half coil connection., A 90°, B 120°, C 180°, D 240°, , 19 What is the effect, if coil group connection is, wrongly connected in a single phase motor, rewinding?, A Motor runs slowly, B Motor will not run, C Motor runs in very high speed, D Motor runs and takes more current at no load, , 14 Why one slot gap is kept between starting &, running winding of a ceiling fan?, , A, B, C, D, , To give shape to winding, To get uniform magnetic field, To give phase angle displacement, To increase the torque, , 15 What is the effect if some slots in a split, phase motor left without winding after, completing concentric winding?, A Speed reduced, B Torque reduced, C Works normally, D Heat increase, 16 What defect will occur if over hang of a, winding increase in split phase motor?, A More copper required, B Length of slot liner to be minimum, C Not able to tighten the end covers, D Not able to install the rotor, , - NIMI Question Bank -, , Page7/ 8

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Module 4 : AC Machine winding - Key paper, Questions: Level 1, , Questions: Level 2, , Question: Level 3, , SL.No, , Key, , SL.No, , Key, , SL.No, , Key, , 1, , 1, , 12, , D, D, B, A, C, B, A, D, C, D, A, D, , 1, , 12, , D, A, B, B, D, A, C, D, B, C, B, C, , 12, , B, A, D, B, C, B, D, A, A, B, D, A, , 13, , B, , 13, , A, , 13, , A, , 14, , B, , 14, , A, , 14, , C, , 15, , A, , 15, , A, , 15, , C, , 16, , C, , 16, , A, , 16, , C, , 17, , B, , 17, , C, , 17, , B, , 18, , D, , 18, , C, , 18, , B, , 19, , C, , 19, , B, , 20, , A, , 21, , D, , 22, , B, , 23, , C, , 24, , C, , 25, , B, , 26, , A, , 27, , A, , 28, , A, , 29, , D, , 30, , D, , 31, , A, , 32, , C, , 33, , C, , 34, , A, , 35, , C, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, , - NIMI Question Bank -, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, , Page8/ 8

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Electrician - Semester II - CITS Module 5 : Rectifiers - Invertors AC/DC Drives, Questions: Level 1, 1, , A, B, C, D, 2, A, B, C, D, 3, , Which control system consumes very low, power for motion control in AC and DC, motors?, Field control, Drives control, Voltage control, Armature control, Which drive is classified according to mode, of operation?, Group drive, Manual drive, Individual drive, Continuous duty drive, What is the name of the characteristic curve, in D.C drive?, , A, B, C, D, , Speed Vs torque characteristic, Torque Vs field current characteristic, Speed Vs armature current characteristic, Field current Vs armature, , 4, , What is the name of the component marked, ‘X’ in the block diagram of AC drive?, , A, B, C, D, , Rectifier, D.C bus, Inverter, A.C motor, , 5, A, B, C, , What is electric drive?, A device used as prime mover for generator, A device converts A.C to D.C supply, An electro mechanical device for controlling, motor, A machine converts mechanical energy into, electrical, , D, , 6, A, B, C, D, , What is the full form of B.O.P in D.C drive?, Bridge Operation Panel, Basic Operational Panel, Basic Operation Programme, Bridge Operator Programme, , 7, , What is the minimum permissible single, phase working voltage, if the declared, voltage is 240V as per ISI?, 233 V, 228 V, 216 V, 211 V, , A, B, C, D, , A, B, C, D, , Which term refers that the mass of a, substance liberated from an electrolyte by, one coloumb of electricity?, Electrolysis, Electro plating, Electro copying, Electro chemical equivalent, , 9, A, B, C, D, , What is the full form of abbreviation UPS?, Uniform Power Supply, Universal Power Supply, Unregulated Power Supply, Uninterrupted Power Supply, , 10, A, B, C, D, , Which is frequency converter?, Rectifiers, D.C choppers, Cyclo converters, D.C to A.C converters, , 11, A, B, C, D, , What is the full from of PWM?, Pulse Wide Modulation, Pulse Width Modulation, Phase Wide Modulation, Phase Width Modulation, , 8, , 12 Which device in A.C drive controls the speed, of A.C motor?, A Field supply unit, B COMMS technology bore, C Speed feedback technology bore, D Micro processor controlled electronic device, , - NIMI Question Bank -, , Page1/ 10

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13 What is the relation between synchronous, speed (Ns) in RPM frequency (F) in hertz and, (P) of poles?, A, 120 P, Ns =, F, 120 F, B, Ns =, P, C N s = PF, 120, D Ns = F, 120 P, 14 What are the two main components in A.C, drive?, A Rectifier and inverter, B Transformer and rectifier, C Transformer and inverter, D Transformer and control panel, 15, A, B, C, D, 16, A, B, C, D, , What is the full form of VVVFD in A.C drive?, Variable Voltage Variable Frequency Drives, Voltage Variable Very high Frequency Drives, Variable Voltage Values and Frequency, Drives, Variable Values of Voltage and Frequency, Drives, What is the full form VFD in A.C drive?, Volt Forward Drives, Variable Force Drives, Voltage Frequency Drives, Variable Frequency Drives, , 17 What is the formula to calculate, Volt/Frequency (V/F) ratio?, 4.444φ M, A, V /F =, N, B V/F = 4.444 NϕM, C V / F = 4.444N, φM, D V/F = 4.44/xϕM2, , 19 Which is the AC input power receptacle in, UPS?, , A, B, C, D, , 1, 2, 3, 4, , 20 Which is the correct equation, related to, phase voltage ‘V’ frequency ‘F’, No of turns, ‘N’ and magnetic flux ϕm of the DC motor?, A V = 4.444 f N ϕm, B, 4.444Nf, V=, Nφ m, 4.444Nf, C, V=, φm, φm, 4, ., 444, D V=, Nf, 21 Which part is provided in UPS for source of, power, if supply fails?, A Rectifier, B Inverter, C Battery, D Control relay, , 18 How the output capacity of UPS is, expressed?, A W, B VA, C AH, D KWH, , - NIMI Question Bank -, , Page2/ 10

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8, , Questions: Level 2, 1, A, B, C, D, 2, A, B, C, D, 3, A, B, C, D, 4, A, B, C, D, 5, A, B, C, D, 6, A, B, C, D, 7, A, B, C, D, , What is the function of power controller in, drive circuits?, It sounds an alarm in no load conditions, It detects the overloading condition of motor, It reduce motor current during transient, operation, It maintain the torque at low voltage, conditions, Why it is necessary to keep V/F ratio, constant in a drive?, Keep the stator flux maximum, Maintain the rotor current minimum, Maintain the speed of motor constant, Maintain the rated torque at all speeds, Which power modulator used in the electric, drive system?, Cyclo converters, Frequency multiplier, Phase sequence indicator, Servo controlled voltage stabilizer, Which type of sensing unit employed in drive, system?, Opto coupler, Speed sensing, Photo voltaic cell, Resistance temperature detector, Which type of machine in industries is, provided with multi motor electric drive?, Rolling machine, As per supply voltage, As per no volt coil rating, Heavy duty electric drilling machine, Which control system is used for Eddy, current drives?, Slip controller, Rectifier controller, AC voltage controller, DC chopper controller, What is the purpose of JOG key in control, panel of D.C drive?, Stop the motor, Restart the motor, Inching operation, Reverse the direction of motor, , A, B, C, D, 9, , A, B, C, D, , What is the purpose of LCD on basic, operator panel in D.C drive?, Indicate the fault, Display the speed, Monitor the parameter, Display availability of supply, What is the reason of using shielded cable, for connecting low level signal circuits in DC, drives?, Easy for connection, Good appearance, Protects from mechanical injuries, Eliminates the electrical interference, , 10 Which device controls the speed of A.C, motor in A.C drive?, A Field supply unit (FSU), B COMMS technology box, C Speed feedback technology box, D Microprocessor based electronic device, 11, A, B, C, D, , What is the main use of A.C drive?, High starting torque, Group drive motors, Control stepless speed in motors, Interlocking system in industries, , 12, A, B, C, D, , What is the function of IGBT in AC drive?, Smoothening incoming A.C supply, Controls the power delivered to the motor, Stabilize the output voltage from the rectifier, Converts incoming A.C power into, D.C power output, , 13 Why the A.C drives are better suited for high, speed operation?, A High starting torque, B Robust in construction, C Having lighter gauge winding, D No brushes and commutation, 14 What is the advantage of AC drive compared, to DC drive?, A Requires less space, B Installation and running cost is less, C Fast response and wide speed range of, control, D Power circuit and control circuits are simple, 15 Which is the application of single quadrant, loads operating in first quadrant in drives?, A Hoists, B Elevators, C Conveyors, D Centrifugal pumps, , - NIMI Question Bank -, , Page3/ 10

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16 What is the function of Field Supply Unit, (FSU) in DC drive?, A Produces required firing current to the firing, circuit, B Provides variable voltage to the field winding, of motor, C Provides a constant voltage to the field, winding of motor, D Provides a constant voltage to the armature, of the motor, 17 What is the disadvantage of DC drive?, A Not suitable for high speed operation, B More complex with a single power, conversion, C More expensive than AC drive for high, capacity motor, D Installation of DC drives is more complicated, , 22, A, B, C, D, , What is IGBT in VF drive?, Inverter switching device, D.C bus switching device, Rectifier switching device, Field supply switching device, , 23, A, B, C, D, , What is the function of VSI drives?, Converts A.C to D.C, Converts A.C to A.C, Converts D.C to A.C, Converts D.C to D.C, , 24 Why the A.C drives are mostly used in, process plant?, A Easy to operate, B Robust in construction, C Very high starting torque, D Maintenance free long life, , 18 What is the purpose LCD in Basic Operator, Panel (BOP) in AC drive?, A Indicate the status of drive, B Monitor the parameter of AC drive, C Indicate the display error in reading, D Indicate the incorrect operation of BOP, , 25 What is the advantage of on-line UPS over, offline UPS, A Supplies constant power output, B It gives constant output frequency, C Works on single phase or three phase supply, D Free from change over and transition, problems, , 19 Which is the correct sequence operation of, key button in BOP of AC drive to change the, direction of rotation?, A Press ON →REV → ON, B Press OFF → REV → ON, C Press ON → OFF → REV → ON, D Press ON →REV → OFF → ON, , 26 Which electronic circuit is used in a, automatic voltage stabilizer to produce, constant output voltage?, A Rectifier circuit, B Amplifier circuit, C Oscillator circuit, D Feedback circuit, , 20 What is the purpose of PROG / DATA button, in BOP of AC drive?, A To change the parameter setting, B To store the entered data and factory stored, data, C To display the data direction of rotation, forward / REV, D To display the data status of frequency and, current, , 27 Which feedback network is used for, automatic voltage stabilizers?, A Current divider network, B Voltage divider network, C Tapped transformer network, D Resistance temperature detector network, , 21 Which is proportional to the torque in D.C, motor?, A Back E.M.F, B Field current, C Terminal voltage, D Armature current, , 28 Which electrical device is actuating the, voltages in a stepped voltage stabilizer?, A Autostat, B Output transformer, C Over voltage relay, D Under voltage relay, 29 What is the effect in internal resistance of a, discharged cell?, A Increase, B Decrease, C Becomes zero, D Remain same, , - NIMI Question Bank -, , Page4/ 10

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30 Calculate the voltage and ampere/hour, if, four cells rated as1.5 v and 8 A.H are in, parallel?, A 6 v and 24 AH, B 3 v and 16 AH, C 4.5 v and 8 AH, D 1.5 v and 32 AH, , 37 What is the type of A.C voltage stabilizer?, , 31 Which is the application of automatic, stepped voltage stabilizer?, A Geyser, B Grinder, C TV Receiver, D Air conditioner, , A, B, C, D, , 32, A, B, C, D, , Which is the function of an inverter?, Converts A.C voltage into D.C voltage, Converts D.C voltage into A.C voltage, Converts D.C voltage into higher D.C voltage, Converts A.C voltage into higher A.C voltage, , 33 What is the purpose of output transformer in, inverters?, A Step up input AC, B Step down input AC, C Step up AC from amplifier, D Step down AC from amplifier, 34 Which type of output transformer is used in, automatic voltage stabilizer?, A Auto transformer, B Static transformer, C Ring core type transformer, D Ferrite core type transformer, 35 Which principle the constant voltage, transformer works?, A Self induction principle, B Fall in potential principle, C Ferro-resonant principle, D Mutual induction principle, 36 Which transformer is used in servo voltage, stabilizer?, A Step up transformer, B Step down transformer, C Torodial autotransformer, D Constant voltage transformer, , Servo voltage stabilizer, Automatic voltage stabilizer, Manual stepped voltage stabilizer, Constant voltage transformer stabilizer, , 38 Which instrument is used to check short, circuit faults in electronic circuit in voltage, stabilizer?, A Ammeter, B Voltmeter, C Ohmmeter, D Multimeter, 39 What are the important stages in a simple, inverter?, A Oscillator and rectifier stages, B Oscillator and amplifier stages, C Amplifier and transformer output stages, D Oscillator, amplifier and transformer output, stages, 40, A, B, C, D, , Where square wave inverters are used?, Computers, TV receiver, DVD players, General lighting, , 41, A, B, C, D, , What is the function of inverter in A.C drive?, Converts A.C to D.C voltage, Stabilize the constant voltage, Varies the frequency to control the speed, Converts D.C voltage back to A.C voltage, , 42 Why as per the name plate detail, the, voltage/frequency ratio of the motor must be, maintained in A.C drive?, A To reduce the voltage drop, B To obtain maximum efficiency, C To maintain constant frequency, D To maintain constant power factor, 43, A, B, C, D, , What is the main functions of A.C drive?, Maintains constant frequency, Changes the voltage as required, Improves the power factor in industry, Maintains constant speed, , - NIMI Question Bank -, , Page5/ 10

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44 Which region A.C drive is operated above its, rated frequency?, , A, B, C, D, , 50 How supply is fed to the load by OFF-line, UPS, if power supply is available?, , A, B, C, D, , Constant time region, Constant volt/frequency region, Constant horse power region, Constant voltage/current region, , 45 How the magnetic saturation can be avoided, in AC drive?, A By reducing the magnetic force, B By keeping the flux density constant, C By keeping the magnetic flux constant, D By varying the number of turns of the coil, 46, A, B, C, D, , What is the disadvantage of A.C drive?, Maintenance cost is very high, It produces a simulated wave form, Operation is complicated, not easier, Not suitable for high speed operation, , 47, A, B, C, D, , What is the use of D.C bus in A.C drive?, It converts D.C into A.C, It delivers the power to the motor, The power from rectifier is stored on it, It simulate the sine wave at particular, frequency, , 48 What is the use of P.W.M to the A.C motor in, A.C drive?, A To convert A.C pulse into D.C, B It deliveries the stored power to AC drive, C It smoothness the incoming power supply, D To simulate a current sine wave to the, desired frequency, 49 Which precaution to be taken while, connecting circuit breaker to main supply?, A Separate wiring from main wiring, B Share the full load of main wiring, C Can share 10% over load of KVA rating only, D Can share 10% less load of KVA rating only, , Inverter directly supply power, Main supply directly supply power, Main supply through filter & will supply power, Battery and inverter will supply power, regulator, , 51 How supply is fed to the load by ON-line, UPS, when power supply is available?, , A, B, C, D, , Inverter directly supply load, Main supply directly supply load, Main supply through inverter to load, Battery supply through inverter to load, , 52 Which are the important stages in a simple, inverter?, A Oscillator and rectifier stage, B Oscillator and amplifier stage, C Amplifier and transformer output stage, D Oscillator, amplifier and transformer output, stage, 53 Why the A.C drives are mostly used in, process plants?, A Easy to operate, B Robust in construction, C Very high starting torque, D Ruggedness and maintenance free long life, 54 What is the purpose of LED indicators in, BOP panel of DC drive?, A To indicate the status of drive, B To indicate system running, C To indicate fault occurred, D To indicate availability of power, , - NIMI Question Bank -, , Page6/ 10

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55 Why the shielded cable is recommended for, the tachometer?, A To measure correct speed, B To avoid break of cable, C To eliminate electrical interference, D To reduce the device error, 56 What does the green LED indicate in BOP of, DC drive?, A Warns before fault occur, B System running, C Status of drive, D Power supply is 'ON', , - NIMI Question Bank -, , Page7/ 10

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8, , Questions: Level 3, 1, A, B, C, D, 2, A, B, C, D, 3, A, B, C, D, 4, A, B, C, D, 5, , A, B, C, D, 6, A, B, C, D, 7, A, B, C, D, , How the base speed of D.C shunt motor can, be increased by using D.C drive?, By reducing the field current, By increasing the field current, By increasing the supply voltage, By reducing the armature voltage, , A, B, C, D, , How the constant torque can be obtained, from armature and field controlled drives?, By reducing the field current, By increasing the field current, By reducing the armature current, By controlling the armature voltage, , A, B, C, D, , How the backup time of UPS can be, increased?, Increase the VA rating of UPS, Increase the AH capacity of battery, Decrease the AH capacity of battery, Maintain battery terminal voltage always, 90% of rating, , A, B, C, D, , How the hard sulphation defect in, secondary cell can be prevented?, Provide trickle charging, Provide freshening charge, Provide constant current charging, Provide constant potential method charging, Which part in UPS supplies continuous, output voltage in case of input voltage, failure?, Battery unit, Inverter unit, Rectifier unit, Controller unit, What is the effect during loading of the cell,, the current strength falls and become zero?, Buckling, Polarization, Local action, Polarity short, What is the reason for having low back up, time in UPS?, Fault in inverter circuit, Battery is short circuited, Mains earthing is not proper, Ampere hour (A.H) capacity of battery is not, sufficient, , 9, , 10, , 11, , A, B, C, D, 12, A, B, C, D, 13, A, B, C, D, 14, A, B, C, D, , Which is the cause for the fault if the output, voltage of UPS is higher than normal?, Battery get short circuited, Defective feedback circuit, Input voltage is very high, Relay points are joined together, What is the reason for tripping the UPS with, full load?, Main supply failure, Incorrect overload settings, Battery charger input fuse blown out, Loose connection in battery terminal, How the A.C drives control the speed of A.C, motor?, By providing double cage rotor, By changing the number of poles, By varying output voltage and frequency, By interchanging the connection terminals in, motor, Which refers, if the A.C motor operates at, less than rated V/Hz ratio and above rated, name plate speed?, Field effect, Field operation, Field weakening, Field strengthening, How, the rated torque at all speeds can be, maintained in A.C motor?, By keeping the voltage constant, By keeping the load constant, By keeping the current-to-frequency ratio, constant, By keeping the voltage-to-frequency (V/F), ratio constant, Why the A.C drives are better suited for high, speed operation?, Not having brushes, Robust in construction, High starting torque, Having lighter gauge winding, Why UPS works on 240v - AC mains only, and rotor on battery ?, Battery fuse is blown out, Inverter fuse is blown out, Input AC mains is very low, Charger input fuse blown out, , - NIMI Question Bank -, , Page8/ 10

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15, , A, B, C, D, 16, A, B, C, D, , What is the reason, if the UPS is switched, ON without load but DC under voltage, indicator turns ON ?, Short circuit, Load too high, Inverter fuse is blown, Overload setting in wrong, Which is the reason that UPS does not, switch ON in battery mode?, Check oscillator circuit, Problem in inverter circuit, Main filter capacitor problem, Over control cord is not functioning properly, , 17 Which is the reason for the charger does not, turn ON when UPS in switched ON?, A Inverter fuse is blown out, B Mains input fuse blown out, C Mains earthing is not proper, D Main filter capacitor problem, 18 What precautions to be observed while, removing components from PCB of voltage, stabilizer?, A Ascertain absence of D.C. voltage, B Ascertain the transistor are not shorted, C First ascertain from the possible test with in, the circuit, D Position of terminal connections and hook, up connection to be noted, 19, , A, B, C, D, 20, A, B, C, D, , What is the cause, if the relays in stabilizer, will show higher output voltage than input, voltage with boost indication?, When both transists are short, When both transistors are open, Presence of D.C supply makes relays in, operative, Presence of control voltage makes relays in, operative, When the relay will show lower output, voltage than input voltage buck indicator?, When transistors are open, When transistors are short, Presence of D.C supply makes relays in, operative, Presence of constant voltage makes relays, in operative, , - NIMI Question Bank -, , Page9/ 10

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Module - 5 : Rectifiers - Invertors AC/DC Drives - Key paper, Questions: Level 1, , Questions: Level 2, , Question: Level 3, , SL.No, , Key, , SL.No, , Key, , SL.No, , Key, , SL.No, , Key, , 1, , B, D, A, B, C, B, B, D, D, C, B, D, B, A, A, D, B, B, A, A, C, , 1, , B, D, A, B, A, A, C, C, D, D, C, B, D, B, D, C, A, B, C, B, D, A, B, D, D, D, B, A, A, D, C, B, C, , 34, , A, C, C, C, D, D, D, D, D, B, B, B, A, A, B, A, B, B, D, B, A, C, B, , 1, , A, D, B, A, A, B, D, B, B, C, B, C, D, A, C, B, A, A, A, B, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, , 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, , - NIMI Question Bank -, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, , Page10/ 10

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Electrician - Semester II - CITS - Module 6: Industrial Wiring - Control Panel, Questions: Level 1, 1, A, B, C, D, 2, A, B, C, D, 3, , What is the name of the device marked ‘X’ in, the circuit?, , A, B, C, D, , Contactor, No volt coil, Stop button, Overload relay trip, , 7, , What is the name of the accessory used in, control panel wiring?, , A, B, C, D, , Wire ferrules, Wire sleeves, Nylon cable ties, Cable binding strap, , 8, , What is the name of the accessory used in, control panel wiring?, , A, B, C, D, , Lugs, Thimble, Crommet, Terminal connector, , Which supply indicates by the colour of, conductor exhibited on Red, Blue, Black?, Supply DC 3 wire system, Single phase AC system, Supply AC system 3 phase, Apparatus AC system 3 phase, Which cable ties are used to bunch the, wires?, Silk ties, P.V.C ties, Nylon ties, Cotton ties, , A, B, C, D, , Which device is avoided in the panel board, assembly?, Sensors, Indicating lamp, Isolating switch, Push button switch, , 4, , What is the name of the device marked ‘X’?, , A, B, C, D, , Stop button, Start button, Main contact, Auxiliary contact, , 5, , What is the name of the wiring accessory, used in control panel wiring?, , A, B, C, D, , 6, , DIN rails, G channel, Grommets, Race ways, , - NIMI Question Bank -, , Page1/ 7

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9, , What is the name of the contact marked as, ‘X’?, , X, , A, B, C, D, , Star contact, Delta contact, Auxiliary contact, Overload relay contact, , 10 What is the name of device, that operates, electrically controlled double break switch?, A Contactor, B Limit switch, C Isolating switch, D Relay, 11 What is the name of the accessory that is, made by chromated metal?, A Race ways, B DIN Rail, C Lugs, D Contactors, , - NIMI Question Bank -, , Page2/ 7

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Questions: Level 2, 1, A, B, C, D, , What is the function of isolator switch?, Trips automatically at overload, Protect the circuit from short circuit, Operated by the motion of an object, Manually operated switch to disconnect the, circuit, , 2, A, B, C, D, , Which trips the circuit, as it is over loaded?, MCB, ELCB, Isolator, Contactors, , 3, , Which device protects from overload and, short circuit in a panel board?, Isolating switch, Time delay relay, Thermal overload relay, Miniature circuit breaker, , A, B, C, D, 4, A, B, C, D, 5, A, B, C, D, 6, , Which switch with an actuator is operated by, the motion of a machine or part of an object?, Limit switch, Toggle switch, Isolating switch, Push button switch, Which switch is operated at OFF load, condition?, Limit switch, Isolating switch, Two way switch, Push button switch, , A, B, C, D, , What is the reason for providing two, separate Earthing in panel board?, Panel board is made in metal box, Control the stray field in the panel, Reduce the voltage drop in panel board, Ensure one earthing in case of other failure, , 7, A, B, C, D, , Which circuit, the limit switches are used?, Lift circuits, Street lighting, Motor control circuits, Domestic power circuits, , 8, , How the control circuit voltage and power in, a contactor are to be selected?, As per rated current, As per supply voltage, As per no volt coil rating, As per the type of supply, , A, B, C, D, , 9, A, B, C, D, , What is the criteria to select the contactor?, Type of supply, Type of load connected, Supply voltage and load, Place of use the contactor, , 10 Which accessory is used to mount MCB,OLR, in the panel board without using screws?, A DIN Rail, B G. channel, C Grommets, D PVC channel, 11 Which type of device protects motors from, over heating and over loading in a panel, board?, A Rectifier, B Limit switch, C Thermal relay, D Electro mechanical relay, 12 What is the use of ‘G’ channels in control, panel?, A For fixing relays, B For fixing contactors, C For fixing instruments, D For fixing terminal connectors, 13 Which is the standard duty cycle code of the, contactor for starting and stopping the AC, resistive and inductive load?, A AC1, B AC2, C AC3, D AC4, 14 Which is the correct sequence operation of, contactors for operating automatic star delta, starter?, A Main→Star→Delta →Timer, B Star→ Main→Timer→Delta, C Main→Timer→Delta→Star, D Star→Timer→ Main→Delta, 15 Why control panels are provided with control, transformer?, A To maintain rated voltage to load, B To operate the auxiliary circuits, C To maintain rated main supply voltage, D To supply reduced voltage to power circuit, , - NIMI Question Bank -, , Page3/ 7

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16 What is the use of PVC channel in a control, panel wiring?, A Mounting MCB, B Mounting relays, C Path way for electrical wiring and protection, D Mounting double deck terminal contactor, , 23 Which type of contactors are used for, starting of shunt motors?, A DC1, B DC2, C DC3, D DC4, , 17 What is the purpose of thermal over load, relay in control panel?, A Switching ON/OFF the circuit, B Protect the circuit from earth fault, C Control the circuit based on time delay, D Protect the motor from over heating, and loading, , 24 How many self holding normally open, contacts are provided for two motor, sequential control?, A 1, B 2, C 3, D 4, , 18 Why sequential control of motors is required, in an industrial application?, A To share more loads, B To reduce power consumption, C To minimise the operating cost, D To increase the accuracy of operation, , 25, A, B, C, D, , 19 Which material is used to make open frame, bimetallic adjustable thermostat contacts?, A Silver, B Brass, C Copper, D Bronze, , What is the use of nylon cable ties?, To connect the terminal, To hold (or) bunch the cables, To identify the polarity of cables, To increase mechanical strength, , 26 Which standard AC duty cycle contactor is, used for heaters and furnaces?, A AC1, B AC2, C AC3, D AC4, , 20 What is the purpose of DIN-rail used in, control panel wiring?, A It provides a path way for electrical wiring, B Install the high powered circuit accessories, C Mounting the double deck terminal, connectors, D Mounting the control accessories without, screws, 21 Which device controls the operations in, sequential control systems?, A Timer, B Relays, C Contactor, D Control transformer, 22 Which DC load is represented by the DC4, standard duty cycle of contactors?, A Resistive loads except motor loads, B Starting and stopping of shunt motor, C Starting and stopping of series motor, D Starting and stopping with in charge and, braking, , - NIMI Question Bank -, , Page4/ 7

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Questions: Level 3, , 7, , 1, , A, B, C, D, , A, B, C, D, 2, A, B, C, D, 3, A, B, C, D, 4, A, B, C, D, 5, A, B, C, D, 6, , A, B, C, D, , How the contacts in a contactor can be, engaged for working?, By manual operation, By mechanical settings, By operating electromagnet to change the, position, By using bimetallic strip to change the, position, Which prevents flare out of stripped and, stranded cables in the panel board?, Sleeves, Wire ferrules, Lugs and thimbles, Cable binding straps and button, How to protect the cable from insects and, rats into the panel?, By using sleeve, By using crommets, By using cable binding straps, By providing nylon cable ties, What essential feature to be considered, while designing a layout of control panel?, Proper type of protection and measuring, system, Inside area and number of indicating lights in, front panel, Suitable method of labeling and cable, harnessing, Outside dimensions and swing area of, cabinet door, Why power and control wirings run in, separate race ways?, To reduce heat, To reduce the radio interference, To increase the insulation resistance, To increase the current carrying capacity, Why the motor is not changing the direction,, if reverse push button is pressed in forward, and reverse control star delta starter?, No volt coil is not energized, Fault in forward contactor, Due to interlock in reverse contactor, No voltage exist in reverse contactor, , 8, A, B, C, D, 9, A, B, C, D, , What happen, if time delay relay of a auto, star delta starter not open during starting?, Does not start, Runs normally, Runs in star only, Start and stops, What is the effect of connecting cables in, control panel without grommets?, Reduces voltage drop, Protect the cable from break, Increase the insulation resistance, Increase the current carrying capacity, What is the reason, if DOL starter wired, motor stops immediately after switching ON?, High speed, Low overload current setting, Supply frequency incorrect, Over lubrication, , 10 What is the reason for the contactor coil is, failed with overheating?, A Over load in motor, B Over voltage, C Open contactor coil, D Higher voltage rate coil, 11 What will happen if 'ON " contact is damaged, and permanent open?, , A, B, C, D, , Motor will not run, Over current in control circuit, Remote control will not work, Remote control only will work, , 12 What will happen if 'K1" contactor coil is used, on 500V instead of 240V?, , A, B, C, D, , Work normally, Circuit will damage, Will not work, will chatter the contacts, , - NIMI Question Bank -, , Page5/ 7

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13 Why the forward reverse control circuit fails, to change direction of rotation. What is the, reason?, A Brake provided in one direction, B Phase sequence is same, C Phase sequence is not same, D Low voltage in one phase, 14 What will happen if AC1 contractor is used for, jogging of crane motor?, A Works normally, B Contactor damages instantly, C Contactor coil heats up, D Contact faces damage, 15 What happens, if time delay relay of a auto, star delta starter still in closed condition after, starting?, A Starts and stop, B Runs normally, C Runs in star only, D Runs in delta only, 16 What happens in the control circuit of a 12V, DC contactor if a 12V AC contactor coil is, replaced ?, A The contactor does not function because of, less current through the coil, B The contactor will be damaged because of, excessive heating up of coil, C The contactor does function normally without, abnormal effects, D The contactor does function but will produce, more noise, , - NIMI Question Bank -, , Page6/ 7

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Module 6 : Industrial Wiring - Control Panel - Key paper, Questions: Level 1, , Questions: Level 2, , Question: Level 3, , SL.No, , Key, , SL.No, , Key, , SL.No, , Key, , 1, , A, C, A, D, A, D, D, C, C, A, B, , 1, , 1, , 12, , D, C, D, A, B, D, A, C, C, A, C, D, , 12, , C, C, B, D, B, C, C, C, B, B, D, C, , 13, , B, , 13, , B, , 14, , B, , 14, , D, , 15, , B, , 15, , D, , 16, , C, , 16, , B, , 17, , D, , 18, , D, , 19, , A, , 20, , D, , 21, , A, , 22, , C, , 23, , B, , 24, , B, , 25, , B, , 26, , A, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, , - NIMI Question Bank -, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, , Page7/ 7

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Electrician CITS - Semester- II Module 7: Domestic Appliances, Questions: Level 1, , 6, , 1, , A, B, C, D, , What is the name of the part of electric iron?, , 7, A, B, C, D, , A, B, C, D, , Sole plate, Pressure plate, Mica insulation, Asbestos sheet, , 2, , Which formula is used to calculate the heat, generated as per Joules law?, Heat generated = IRT / J cal, Heat generated = I2RT / J cal, Heat generated = IR2T / J cal, Heat generated = (IR)2 T / J cal, , A, B, C, D, 3, , 8, , A, B, C, D, , What is the magnetron tube filament voltage, used in microwave oven?, 1.5 V A.C, 2.0 V A.C, 3.0 V A.C, 3.2 V A.C, , 4, , What is the name of the circuit?, , 9, A, B, C, D, , Electronic fan regulator, Electronic voltage multiplier, Electronic voltage stabilizer, Electronic triggering circuit of SCR, , 5, , What is the value of insulation resistance of, an electrical appliance?, Should be less than one Ohm, Should be one Ohm, Should not be less than one to 10 megohm, Must be more than 10 megohm, , Which part of the electric iron is pressed, over the clothes to be ironed?, Sole plate, Pressure plate, Heel plate, Heating element, Which part is used to regulate the, temperature of automatic electric iron?, Sole plate, Pressure plate, Power cord, Thermostat, Which part is used to connect the supply to, the electric iron?, Handle, Sleeve, Power cord, Pressure plate, , 10 Which part is marked as ‘X’ in the typical, outline of a steam iron?, , A, B, C, D, , A, B, C, D, , A, B, C, D, , A, B, C, D, , Which appliance-works by heating effect of, electric current ?, Food mixer, Kettle, Table fan, Ceiling fan, , Sole plate, Pressure plate, Thermostat, Water tank, , 11 Which electrical appliance is used to heat up, the air space in a room?, A Kettle, B Toaster, C Room heater, D, Hair drier, , - NIMI Question Bank -, , Page1/ 9

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12 How many types of room heaters are there, according to the method of air circulation?, A 2, B 4, C 5, D 6, 13, A, B, C, D, , What is the normal working temperature, range of heating element of a toaster?, 285°C to 900°C, 385°C to 900°C, 385°C to 800°C, 285°C to 800°C, , 14 Which part is marked as ‘X’ in the schematic, diagram of a toaster?, , 18 Which part is marked as ‘X’?, , A, B, C, D, , 19 What is the expansion of HDP?, A High Density Polythylene, B Hard Density Polythylene, C Heavy Density Polythylene, D High Density Polymer, 20, , A, B, C, D, , A, B, C, D, , Thermostatic switch with timer, Centre heating element, Two side heating element, Mechanical lever, , 15 Which is the rotating part of a ceiling fan?, A Stator winding, B Suspension rod, C Canopy, D, Rotor, 16, A, B, C, D, 17, A, B, C, D, , How is the capacity of a ceiling fan is, expressed?, By this blade length, By sweep and voltage, By the voltage range, By speed in r.p.m, , Front cover, Blade shank, Speed regulator, Oscillating knob, , Which electrical effect is used in electric, bell ?, Heating effect, Electromagnetic effect, Lighting effect, Chemical effect, , 21 Which is an audio signalling device?, A Spring bell, B Interupter bell, C Buzzer, D Single stroke, 22, A, B, C, D, , What is the S.I unit of heat ?, Calorie, Joule, Centigrade, Fahrenheit, , What is the minimum clearance between, floor and blade of the ceiling fan?, 2.4 meters, 2.75 meters, 3 meters, 3.5 meters, , - NIMI Question Bank -, , Page2/ 9

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Questions: Level 2, , 6, , 1, , Which material is used to make heating, element?, Silver, Copper, Nichrome, Aluminium, , A, B, C, D, , What is the function of stirrer motor in micro, wave oven?, Draws cooling air inside, Spreads the heat uniformly, Exhausts the hot air outside, Revolves and reflects the electromagnetic, energy, , A, B, C, D, , What is the purpose of U bend marked as, ‘X’ in geyser?, , A, B, C, D, 9, , A, B, C, D, 2, A, B, C, D, 3, , 7, , 8, , A, B, C, D, A, B, C, D, , Prevents draining of water, Avoids the forming of scales, Reduces the pressure of outlet pipe, Restricts the air locking inside the tank, , 4, , Which position of the heater range switch, will give maximum output?, , A, B, C, D, , Position 1, Position 2, Position 3, Position 4, , 5, , Calculate the heat generated in a electric, heater of 1000 watt, 240 volt, worked for 5, minutes?, 70.5 Kilo calories, 71.0 Kilo calories, 71.6 Kilo calories, 72.1 Kilo calories, , A, B, C, D, , 10, A, B, C, D, , What is the purpose of protection grooves at, various places in a heater base plate?, Radiate the heat properly, Retain the heating element firmly, Place the vessels firmly on heater plate, Protect the heating element from damage, What is the purpose of sole plate in electric, kettle?, Acts as a balancing weight, Acts as an insulator for element, Protect the kettle base from damage, Keep the element in close contact with, container, What is the function of neutral path in AC, supply system for appliances?, Provides current return path, Provides voltage level constant, Reduces voltage drop in wiring, Maintains load current constant, What is the function of magnetron tube in a, microwave oven?, Amplifies the microwave signal, Changes the polarity every half cycle, Oscillate and produce cooking frequency, Converts microwave energy to electrical, energy, Which type of motor is used in the wet, grinder?, Universal motor, Repulsion motor, Capacitor start induction run motor, Capacitor start capacitor run motor, , 11, , How is the resistance of the heating element, is calculated?, , A, , By using the formula R =, , B, , By using the formula R =, , C, , A, sI, , sI, A, W, By using the formula R =, V2, , V2, W, 12 Which factor the heat produced in a heating, element depends upon?, A Position of the element, B Current flow and resistance, C Atmospheric condition, D Earthing system, D, , By using the formula R =, , - NIMI Question Bank -, , Page3/ 9

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13, A, B, C, D, 14, A, B, C, D, 15, A, B, C, D, 16, A, B, C, D, 17, A, B, C, D, 18, A, B, C, D, 19, A, B, C, D, 20, A, B, C, D, , What is the advantage of automatic electric, iron?, Cost is less, Can regulate the temperature, Can be used at any voltage, Gives protection from over voltage, What is the function of themostat?, To control the voltage, To adjust the resistance of heating element, To close or open a circuit predetermined, temperature, To protect against earth leakage circuit, Where is the heating element placed in, electric irons?, On the sole plate, On the pressure plate, Over the heel plate, Over the top cover, What is the purpose of the part mechanical, timer in an automatic toaster?, To control the carriage handle, To adjust the toaster time, To adjust the current, To control supply voltage, Which types of motors are used on smaller, size of hair dryers?, Reputation motor, Permanent capacitor, Shaded pole motors, Capacitor start - induction run motor, Which type of motor is used on larger type, hair dryer?, Reputation motor, Universal motor, Permanent capacitor motor, Reluctance motor, Which effect of electricity is used in electric, toaster?, Heating effect, Chemical effect, Magnetic effect, Lighting effect, Which type of room heater is known as, radiant heaters?, Bowl type room heater, Forced draft type room heater, Oscillating type room heater, Rod type room heater, , 21 Which type of room heater has a provision, to blow the air by electric fan through, electrically heated elements?, A Natural draft type room heater, B Forced draft type room heater, C Bowl type room heater, D Rod type room heater, 22 How the capacitor is connected in a ceiling, fan?, A In series with the main winding, B In series with the auxiliary winding, C In parallel with main winding, D, In parallel with auxiliary winding, 23 How is the sweep of ceiling fan is, determined?, A Diameter of the circle to be formed by one, rotation, B Distance from the centre of the fan to tip of, blade, C Distance of the length of the blade, D Distance of the width of the blade, 24, A, B, C, D, , How the speed is varied in a ceiling fan?, By connecting a regulator in parallel, By connecting a regulator in series, By increasing the turns of windings, By decreasing the turns of windings, , 25, , Which type of capacitor is used in ceiling, fan?, Air capacitor, Paper capacitor, Ceramic capacitor, Electrolytic non polarised type, , A, B, C, D, 26, A, B, C, D, 27, A, B, C, D, , What is the function of cotter pin at both, ends of down rod in a ceiling fan?, To prevent falling of this fan by slackening, of bolt nut, To support the top conopy fittings, To avoid tight movement of this fan, To avoid loose alignment of blade, What is the result of over loading a food, mixer?, Smoke coming from coupling, Mixer runs a one speed only, Mixer runs but becomes hot, Mixer runs noisy, , - NIMI Question Bank -, , Page4/ 9

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Which type of food mixer is used with two, core with two pin type cord wire?, A 3 speed mixer, B Single insulated mixer, C Double insulated mixer, D, 2 speed mixer, 29 Which schematic diagram is illustrated?, 28, , A, B, C, D, , Wet grinder circuit, Food mixer circuit, Washing machine circuit, Hair drier circuit, , 29 How the motor of a mixer is operated with, different speeds?, A By tapping from different points of field coil, windings, B By connecting an additional variable, resistance, C By connecting the motor in series with load, D By regulating the supply voltage, , 35, , Which part is marked as ‘X’ in schematic, diagram of table fan?, , A, B, C, D, , Regulator, Running winding, Starting winding, Connecting cord, , 36 Which type of resistors are used in auto fire, alarm circuit?, A LDR, B Varistors, C Sensistors, D Thermistors, 37 Which type of wiring is to be done in fire, alarm system?, A PVC conduit, B Metal conduit, C PVC casing & capping, D, CTS wiring (Repair wiring), , 30 How the speed is regulated in a table fan?, A By using a series resistor, B By tapping the field winding, C By using a capacitor, D By field divertor, , 38 How the immersion heater tube ends are, sealed?, A By china clay, B By insulating wax, C By pre adhesive, D By thermal and water proof compound, , 31 Where the stator windings are placed in a, table fan?, A On crank disc shaft, B In slots of the laminated iron core, C In the oscillating unit, D In the vertical spindle, , 39 Why water level indicator is provided in a, immersion heater?, A To get appropriate heat, B To reduce the heat of the tube, C To increase the heat efficiency, D, To protect water from entering terminal, , 32 What should be the minimum value of, insulation resistance of a table fan?, A Should be one Ohm, B Should not be less than one Ohm, C Should be three megohm, D, Should not be less than one megohm, , 40, , 34 Where is the blades are attached in a table, fan?, A To the front cover, B To the rotor shaft, C To the stator, D, To cross gear, , A, B, C, D, 41, A, B, C, D, , How microwave converted as heat inside, microwave oven?, By high speed oscillation microwave, By changing the polarity at low speed, By low speed oscillation of microwave, By changing the frequency at high speed, What is the frequency of microwave in, microwave oven?, 2000 MHz, 2250 MHz, 2350 MHz, 2450 MHz, , - NIMI Question Bank -, , Page5/ 9

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42 What is the value of output DC voltage that, converted by voltage doubler circuit in, microwave oven?, A 2800 v, B 3200 v, C 3800 v, D, 3900 v, , 49, , 43 Which part of microwave oven helps uniform, heating of foods?, A Cook relay, B Stirrer motor, C Blower motor, D, Dual latch switch, , 50 Which pump is also called as piston pump?, A Jet pump, B Centrifugal pump, C Submersible pump, D, Reciprocating pump, , 44 Which material is used as heat insulators in, geyser?, A PVC, B Fiber, C Asbestos, D Glass wool, 45 Which type of AC single phase motor is, used in washing machine?, A Capacitor start induction run motor, B Repulsion motor, C Reluctance motor, D Shaded pole motor, 46 Which type of washing machine is fitted with, concave shaped disc?, A Air wash, B Agitator wash, C Pulsator wash, D Chaos punch wash, 47, A, B, C, D, , Which type of wash technique is used for, wash delicate fabrics?, Agitator wash, Pulsator wash, Air power wash, Chaos punch wash, , 48 Which washing machine water is propelled, up wards?, A Agitator wash, B Pulsator wash, C Air power wash, D Chaos punch wash, , A, B, C, D, , Calculate the HP of the water pump motor,, if has to deliver 1000 litre to a height of 30, metre within 15 minutes., 0.5 HP, 0.44 HP, 0.48 HP, 0.39 HP, , 51 Which type of A.C. single phase motor is, used for jet pumps?, A Universal motor, B Split phase motor, C Permanent capacitor motor, D Capacitor start induction motor, 52, A, B, C, D, , What is the purpose of heel plate in non automatic electric iron ?, To keep the heating element firmly, To supply a resting point, To transfer the heat from heating element, To increase the weight of iron, , 53 Which type of motor is used in food mixer?, A Shunt motor, B Compound motor, C Universal motor, D, 3 phase motor, 54, A, B, C, D, , Which type of motor is used in ceiling fan?, Repulsion motor, Reluctance motor, Universal motor, Permanent capacitor motor, , 55 What is the condition to change the brushes, of a food mixer?, A If found short by 2/3rd of its original length, B If found sparking on this brushes, C If the mixer is vibrating at low speed, D, If the speed of mixer is very high, 56, A, B, C, D, , Which type of motor is used on table fan?, Reputation motor, Universal motor, Capacitor start- capacitor run motor, Permanent capacitor motor, , - NIMI Question Bank -, , Page6/ 9

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8, , Questions : Level 3, 1, A, B, C, D, 2, A, B, C, D, 3, A, B, C, D, 4, , A, B, C, D, 5, A, B, C, D, 6, , A, B, C, D, 7, A, B, C, D, , What is the reason for a food mixer runs at, one speed only?, Over loading of mixer, The field winding is partially burnt, Worn out brushes, Improper coulping, , What is the fault in a food mixer if it runs, intermittently?, Worn out brushes, Armature coil open, Defective commutator, Field winding partially short, , A, B, C, D, , What is the defect in a single phase pump, motor if it runs with slow speed?, Defective capacitor, Open starting winding, Short in starting winding, Short in running winding, , A, B, C, D, , What is the effect of the loose connection of, pressure plate in an electric kettle?, The heating element will be damaged, Temperature will be more, Current will be increased, Resistance will be increased, , A, B, C, D, , Which type of bearing is used in table fan, motor?, Ball bearing, Jewel bearing, Fluid bearing, Magnetic bearing, , 11, A, B, C, D, , What is the reason for a table fan runs hot?, Blades are out of balance, Due to shorted winding, Misalignment of blades, Loose guards, , Why the heating element of a kettle is, placed and enclosed between two circular, mica pieces?, To distribute the heat uniformly, To avoid contact with any metallic part, To reduce the resistance, To reduce the voltage drop, What is the reason for not giving heat by, hair dryer while the fan is working?, Thermostat is closed, Short in power cord, Open in heater circuit, Power is not available, What is the reason for the heater of hair, dryer operateswhile the blower fan is not, working?, The fan winding open circuited, Improper mounting, Heater open circuited, Loose parts of the blower, What is the reason for connecting a, capacitor in ceiling fan circuit?, For good starting torque, For controlling the speed, For power factor improvement, For increasing the sweep area, , 9, , 10, , What is the reason for running ceiling fan, hot?, Misalignment of blades, Slack capacitor housing, Loose connection in terminals, Partial short circuit in the winding, , 12 What is the reason of humming noise in a, table fan?, A Defect in control switch, B Worn out bearing fit, C Shorted winding, D Blades are unbalanced, 13 What will happen, if immersion heater is, switched ON without water?, A Fuse blown out, B Metal tube burst, C Heated up normally, D Element will not heat, 14 What is the output of heat in a twin unit type, hot plate, if the heating elements are, connected like this?, , A, B, C, D, , OFF, Low, High, Medium, , - NIMI Question Bank -, , Page7/ 9

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15, A, B, C, D, , What will happen, if blower motor failure in, microwave oven?, Over heat in power tranformer, Voltage doubler circuit damaged, No producting of electro magnetic waves, Magnetron assembly damaged due to over, heat, , 16 What is the defect in microwave oven, if, oven shuts down before end of cook cycle?, A Open cook switch, B Open thermo cut out, C Open in power transformer, D Open cook relay contacts, 17 What is the defect, if microwave oven does, not go into cook cycle when cook switch is, activated?, A Defective magnetron tube, B Defective front latch switch, C Defective power transformer, D Defective voltage doubler circuit, , 19 What is the defect, if mixer makes more, noise?, A Loose brushes, B Worn out carlom brushes, C Uneven commutator surface, D Partially burnt out field winding, 20 What is the defect, if a washing machine, switch OFF frequency?, A Low incoming supply, B Incorrect setting of timer, C Defective starting winding, D Defect in running winding of motor, 21, A, B, C, D, , What is defect, if a washing machine gives, shock?, Weak capacitor, Incorrect centrifugal switch, Low insulation resistance value of motor, High impedence value of starting winding, , 18 What is defect, if a food mixer does not run?, A Worn out brushes, B Improper coupling, C Loose mounting screws, D Poor insulation resistance, , - NIMI Question Bank -, , Page8/ 9

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Module 7: Domestic Appliances - Key paper, Questions: Level 1, SL.No, , Key, , 1, , A, B, D, A, C, B, A, D, C, D, C, A, B, A, D, B, B, D, A, B, C, B, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, , Questions: Level 2, SL.No, 1, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, , Key, , C, D, A, B, C, B, D, A, C, C, D, B, B, C, A, B, C, B, A, D, B, B, A, B, D, A, C, C, B, A, A, B, D, B, C, B, C, D, , SL.No, 39, , 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, , - NIMI Question Bank -, , Question: Level 3, Key, , C, D, D, C, C, C, A, C, C, B, B, B, D, B, C, D, A, D, , SL.No, 1, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, , Key, , A, A, A, B, C, A, A, B, D, A, B, B, D, C, D, C, C, A, C, D, C, , Page9/ 9

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Electrician - Semester II - CITS - Module - 8 : Estimation and Costing, Questions: Level 1, 1, , 7, , What is the formula to calculate the diversity, factor?, , A, , Diversity factor =, , Installation load, Minimum actual load, , B, , Diversity factor =, , Minimum actual load, Installation load, , C, , Diversity factor =, , Maximum load, Minimum load, , D, , Diversity factor =, , Minimum load, Maximum load, , 8, , What is the permissible load for the light and, fan sub-circuits?, 600 Watt, 800 Watt, 1000 Watt, 1250 Watt, , A, B, C, , What is the reconmended height for, swithches from the floor level as per, NECode?, 2.5m, 2.25m, 2.0m, , D, , 1.3m, , 2, , Which is mainly required to determine the, dimension of building for preparing wiring, estimation?, , A, B, C, D, , Types of building, Drawing layout, Specification of materials, Schedule of rate, , 3, , What is the recommended size of conduit, pipe used for 3 core copper cable?, 19mm heavy gauge conduit, 25mm heavy gauge conduit, 10mm heavy gauge conduit, 15mm heavy gauge conduit, , A, B, C, D, , Which type of wiring is suitable for computer, room?, Battern wiring, P.V.C casing and capping, P.V.C conduit wiring, , A, B, C, , What is the maximum number of point are, allowed in a light and fan sub-circuits?, 8, 9, 10, , D, , 12, , D, , Metal conduit Wiring, , 10, , 5, , A, B, C, D, , What is the recommended height for the, horizontal run of cables from floor level as, per NEC code?, 3.0m, 2.5m, 2.0m, 1.5m, , A, B, C, , How many number of socket outlet points, are to be provided in a light and fan sub, circuit?, 2, 3, 4, , 6, A, B, C, D, , Which place the rawl plug tool is used?, Non-rigid walls, Rigid walls, Wooden board, Metal board, , A, B, C, D, 4, A, B, C, , 9, , D, , 5, , 11, , What is the recommended rating of a ceiling fan, for estimating the connected load?, , A, B, C, , 40 Watt, 60 Watt, 75 Watt, , D, , 100 Watt, , 12, , A, B, C, , What is the recommended rating of a, incandescent lamp for estimating the, connected loads?, 40 Watt, 60 Watt, 75 Watt, , D, , 100 Watt, , - NIMI Question Bank -, , Page1/ 5

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13, , A, B, C, D, 14, , A, B, C, D, 15, A, B, C, D, 16, , What is the recommended rating of a 6A 3, pin socket outlet for estimating connected, loads?, 60 Watt, 75 Watt, 100 Watt, 125 Watt, What is the recommended rating of a 16 A, power socket outlet for estimatiing, connected rods?, 800 Watt, 1000 Watt, 2000 Watt, 3000 Watt, What is the length of the conduits available, commercially?, 3 meters, 4 meters, 5 meters, 6 meters, , A, B, C, , What is the minimum size of non-metallic, conduit pipes used in wiring?, 12 mm, 16 mm, 20 mm, , D, , 24 mm, , - NIMI Question Bank -, , Page2/ 5

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Questions: Level 2, , 7, , 1, , A, B, C, , What is the purpose of layout diagram in, estimation of conduit wiring?, To calculate the length of conduit and wires, To select number of Accessories, To calculate the connected load, , D, , To select the type of wire, , 8, , A, B, C, , What is the recommented cable size for 5, HP motor by considening full load current, and starting current?, 2.0 mm2 copper conductor, 4.00mm2 copper conductor, 2.0mm2 aluminium conductor, , D, , 1.0mm2 copper conductor, , 9, , When the work of concealed wiring, installation should begin in new building?, Before finishing the plastering work, After finishing the main structural civil work, Before finishing the white wash and painting, work, , A, B, C, , What are the number of 16 A power socket, are recommended for the dwelling area of, 45m2?, 1, 2, 3, , D, , 4, , 2, , What are the numbers of light and fan points are, recommended for the divelling area of 55m2?, , A, B, C, D, , 4 light and 2 fan points, 3 light and 2 fan points, 3 light and 3 fan points, 4 light and 3 fan points, , 3, , A, B, C, , What is the full load current of 5 HP,400V 3, phase induction motor having the efficiency, 80% and power factor of 0.85?, 5.2 Amps, 6.9 Amps, 7.8 Amps, , D, , 9.5 Amps, , 4, , A, B, C, D, , After completion of civil shuttering work, , 10, , Which step to be considered first before, preparing wiring estimation for house?, , A, B, , A, B, C, , When the wiring diagram to be drawn while, preparing wiring estimation?, Before taking measurement, After finalising the layout, Before finalising the layout, , D, , After selecting the size of wire, , D, , 5, , A, B, C, , Which point is to be considered while, planning for load in wiring installation?, Number of labour's required, Provision for the anticipated increase in, loads, Selections of brand of materials, Type of dwelling area, Calculate the labour cost for the below, mentioned wiring work, if the labour cost per, point is Rupees 100/- (i) Meter board - 2, points (ii) Distribution board - 2 points, (iii) light and fan - 17 points (iv) power - 2, points?, Rs 2300, Rs 2500, Rs 2700, , Prepare the wiring layout, Collect the data from consumer like light,, fan and power point required, Collect the required wiring accessories and, materials, Collect the supply service from electricity, board, , D, , Rs 3000, , A, B, C, D, 6, , C, , 11, A, B, C, , What are the factors are to be considered, for estimating the cost of wiring?, Cost of hard ware and labour, Cost of materials and hard ware, Cost of materials and labours, , D, , Cost of materials, hardware and labour, , 12, , When laying of concealed conduits should, be started in a new building?, After completion of main structural civil work, Before finishing the plastering work, Before finishing the white wash and painting, and centring, After completion of civil centring work, , A, B, C, D, , - NIMI Question Bank -, , Page3/ 5

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Questions: Level 3, 1, , A, B, C, , What is the total connected load of an office, room having 2 numbers of 1200mm, fluoresent lamp, 1 fan and one 16 A socket?, 260 Watts, 280 Watts, 1160 Watts, , D, , 1180 Watts, , 2, , What is the minimum recommended size copper, flexible cable required to connect a 3 HP 3 phase, motor?, , A, B, C, D, , 1.5 Sq mm, 2 Sq mm, 2.5 Sq mm, 4 Sq mm, , 3, , A, B, C, , What is minimum recommended size, copper flexible cable required to connect on, 1 HP single phase motor?, 1.0 Sq mm, 1.5 Sq mm, 2 Sq mm, , D, , 2.5 Sq mm, , 4, , What is the minimum recommended size of, conduit required for connecting 5 HP motor with, its starter as per the given figure?, , A, B, C, , 12.5 mm, 19 mm, 25.4 mm, , D, , 38 mm, , 5, , What is the minimum recommended size of, conduit required for connecting 1 HP motor, with its starter as per the given figure?, , A, B, C, , 12.5 mm, 19 mm, 25.4 mm, , D, , 38 mm, , 6, , A, B, C, , What is the allowable current after, considering the diversity factor in a 240V,, 3000 Watts loads in hotel?, 7.50 Amps, 9.375 Amps, 11.25 Amps, , D, , 12.00 Amps, , 7, , What is the allowable current after, considering the diversity factor in a 240V,, 2880 Watts lighting load in house as per, BIS?, 7.20 Amps, 7.92 Amps, 9.60 Amps, 12.00 Amps, , A, B, C, D, 8, , What happens , if undersized cable is used for, connecting pump set motor?, , A, B, C, , Over voltage and pump speed increases, Under voltage and pump speed decreases, Under loading of the cable and speed, decreases, Overloading of the cable and speed, increases, , D, , - NIMI Question Bank -, , Page4/ 5

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Module - 8 : Estimation and Costing - Key paper, Questions: Level 1, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, , Key, , D, B, A, B, B, B, B, B, C, A, B, B, C, B, A, B, , Questions: Level 2, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, , Key, , B, D, C, B, B, A, A, A, A, B, D, D, , - NIMI Question Bank -, , Question: Level 3, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, , Key, , C, B, A, C, B, B, B, A, , Page5/ 5

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Electrician - Semester II - CITS - Module 9 : Power Generation, Questions: Level 1, 1, A, B, C, D, , Which fuel is available in plenty in India for, power generation?, Coal, Diesel, Gas oil, Gasoline, , 2, A, B, C, D, , Which is the conventional power generation?, Wind power generation, Tidal power generation, Solar power generation, Thermal power generation, , 3, A, B, C, D, , Which material is used in solar cell?, Silicon, Copper, Antimony, Phosphorus, , 4, , What is the name of the atomic material, used for nuclear fission in nuclear power, station?, Silicon, Thorium, Antimony, Cadmium, , A, B, C, D, 5, A, B, C, D, , Which is the non conventional energy, source?, Wind, Water, Steam, Diesel, , 6, A, B, C, D, , Which is the natural source of energy?, Sun, Heat, Coal, Biogas, , 7, , Name the constituent marked ‘X’ of the, schematic arrangement of hydro electric, plant., , A, B, C, D, , Penstock, Surge tank, Valve house, Power house, , 8, A, B, C, D, , Which is a non-conventional energy source?, Lignite, Sun rays, Stored water, Pulverized coal, , 9, , Which is the renewable energy source for, producing electricity?, Fuel, Tidal, Water, Nuclear, , A, B, C, D, , 10 Which energy is converted by the possessed, water potential energy?, A Heat energy, B Kinetic energy, C Electrical energy, D Mechanical energy, 11, A, B, C, D, , Which is the main source of energy?, Solar, Wind, Water, Fuels, , 12 Which prime mover cannot be used to, convert heat energy into mechanical energy?, A Steam engine, B Steam turbine, C Internal combustion engines, D Pressure combustion engines, 13 Which energy source is most complex to, produce electricity?, A Fuel, B Wind, C Water, D Atomic material, , - NIMI Question Bank -, , Page1/ 9

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14 Which power generating plant offers no, stand by losses?, A Wind, B Diesel, C Nuclear, D Hydro electric, 15 Which electric generating plant offers only, low power generation?, A Wind, B Nuclear, C Diesel plant, D Hydro electric, 16 Which is the example for a non convention, power generation?, A Tidel, B Hydel, C Nuclear, D Thermal /coal, 17 Which equipment is excluded in main, constituent in a steam power station?, A Prime mover, B Condenser, C Circuit breaker, D Steam generating equipment, 18 What is the washing fluid used in a gas, turbine of steam power plant?, A Air, B LPG, C Diesel, D Methene gas, 19, A, B, C, D, , Which material is used to make solar cell?, Silicon, Antimony, Tantalium, Germanium, , 20 What is the name of material used for, nuclear fission process in nuclear power, plant?, A Uranium, B Cadmium, C Silicon, D Germanium, , - NIMI Question Bank -, , Page2/ 9

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Questions: Level 2, , 9, , 1, , A, B, C, D, , Which is the non conventional power, generation?, Diesel power generation, Nuclear power generation, Wind mill power generation, Hydro-electric power generation, , 10, A, B, C, D, , Which is the residue of bio-mass?, Slurry, Bio fuel, Manure, Bio gas, , 11, A, B, C, D, , Which is the main constituent of biogas?, Oxygen, Methane, Hydrogen, Carbon dioxide, , 12, A, B, C, D, , How electricity produced in solar panel?, While sunlight strikes glass, While sunlight strikes nickel plate, While sunlight strikes manganese, While sunlight strikes on photovoltaic cell, , A, B, C, D, 2, A, B, C, D, 3, A, B, C, D, 4, A, B, C, D, 5, A, B, C, D, 6, , What is the main disadvantage of nonconventional power generation?, Poor efficiency, No constant generation, Can use only light loads, Heavy load cannot be operated, Which power generation requires heavy, water treatment plant?, Hydel power generation, Diesel power generation, Thermal power generation, Nuclear power generation, Which device senses the wind speed in a, wind power generation?, Exciter unit, Turbine controller, Chopper controller, Line controller unit, Which turbine is used for high heads in hydro, electric power plant?, Kaplan turbine, Impulse turbine, Francis turbine, Reaction turbine, What is the function of penstocks in hydro, power stations?, Carries water to dam, Carries water to turbines, Carries water away from power house, Discharges surplus water from reservoir, , A, B, C, D, , Which is the purpose of boiler in a steam, power station?, Super heats the steam, Heats feed water and air, Converts water in to steam, Liberates the heat from burnt fuel, , 7, A, B, C, D, , Which type of power plant is more efficient?, Diesel plant, Steam power, Hydro electric, Nuclear power, , 8, , Which material is used as control rod in a, nuclear reactor?, Thorium, Graphite, Cadmium, Tungsten, , A, B, C, D, , 13 What is the function of air pre heater in a, steam power station?, A Heats feed water, B Supplies hot air to economiser, C Supplies hot air to super heater, D Extracts heat from flue gases and heats, input air, 14 What is the main disadvantage of nuclear, plant?, A Disposal of waste, B Running cost is more, C Plant requires large space, D Installed away from load centre, 15 What is the function of economiser in steam, power plant?, A Converts water into steam, B Heats the air by the flue gases, C Heats the feed water by the flue gases, D Purifies the feed water by chemical treatment, 16 What is the disadvantage of diesel power, plant?, A Makes more noise, B More space is required, C Cannot be started quickly, D Efficiency is lower than other plants, , - NIMI Question Bank -, , Page3/ 9

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17 What is the advantage of non conventional, power generation?, A More reliable, B More efficient, C Low initial cost, D Reduce pollution, 18 What is the function of charge controller in, battery based micro hydel power generation?, A Controls the over voltage, B Disconnects turbine from the battery, C Prevents the over charging of battery, D Controls the over speed of the turbine, 19 What is the purpose of barrage in tidal power, station?, A Controls the tidal waves, B Releases water towards the sea, C Tap the water at the entrance of gulf, D Converts potential energy into kinetic energy, 20 Which component in a steam power plant is, used to heat the feed water from the flue, gas?, A Boiler, B Economizer, C Super heater, D Air pre heater, 21 What is the function of governing system in, diesel power plant?, A Start the engine from cold by supplying the, compressed air, B Maintain the speed of the engine constant, C Control the heat from the engine cylinder to, keep safe temperature, D Reduce the friction of moving parts in engine, 22 What is the advantage of pressurized water, reactor (PWR)?, A No heat loss, B High thermal efficiency, C High power density, D Metal surface temperature is lower, 23 Which power generation plant is having more, reliability in operation?, A Hydro power plant, B Diesel power plant, C Nuclear power plant, D Thermal power plant, , 24 Which is the disadvantage of non, conventional power generation over, conventional power generation?, A Increase pollution, B Security risk is more, C Requires more maintenance, D Cannot be used for base load demand, 25 What is the major disadvantage of wind, power generation?, A Pollution effect is more, B Requires high technology, C Plant installation more complicated, D Wind power is not constant and steady, 26 What is the function of turbine used in tidal, power generation?, A Prevents water flow to other parts of dam, B Converts potential energy into kinetic energy, C Keeps the water flow from low to higher level, D Converts kinetic energy into potential energy, 27 What is the advantage of non-conventional, energy source?, A More reliable, B Low initial cost, C Efficiency is high, D Green house effect is avoided, 28 What is the main draw back of wind mill, energy production?, A Wind mill installs in hills, B Uncertainty of wind available, C Wind mill has too heavy structure, D It requires large area to install, 29 What is the example of a conventional power, generation?, A Sun, B Tidel, C Wind, D Nuclear, 30 Which item is unavailable in the steam, generating equipment?, A Boiler, B Super heater, C Air preheats, D Boiler furnace, 31 What is the function of a boiler in the steam, power plant?, A Water is converted into steam, B Feeds input to economise, C Used only for preheating of air, D Used for making hot water in the plant, , - NIMI Question Bank -, , Page4/ 9

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32 What is the function of a surface heater in a, steam power station?, A Air pre heating, B Supply flue gases to boiler, C Raises the temperature of steam, D Decrease the temperature of steam, , 39 Which device is unavailable part of, lubrication system in the diesel power plant?, A Filters, B Air tank, C Oil tank, D Oil pump, , 33 What is the function of economiser in the, steam power station?, A Heats air for boiler, B Heats the feed water, C Supply flue gases to boiler, D Opens the valve of turbine, , 40 What is the main draw back of gas turbine in, steam power plant, A Smaller in size, B No stand by losses, C No condenser in used, D Efficiency and output are low, , 34 What is the function of air pre heaters in a, steam power station?, A Heats feed water, B Supply hot air to economiser, C Supply hot air to super heater, D Extract heat from flue gases and heat input, air, , 41 What is the necessity of a combustion, chamber in a gas turbine power plant?, A Heating of air, B Filtering of air, C Compressing of air, D Atomization of oil, , 35 Which device converts steam energy into, mechanical energy in a steam power, stations?, A Turbine, B Alternator, C Condenser, D Prime mover, 36 What is the function of super charger in the, diesel power plant?, A Reduce the air pressure, B Increase the air pressure, C Increase the engine efficiency, D Regulate the diesel consumption, 37 Which part of a fuel system is unavailable in, a diesel power plant?, A Silencer, B Strainer, C Storage tank, D Fuel transfer pump, 38 What is the purpose of cooling system in a, diesel power plant?, A Control the oil temperature, B Control the strainer temperature, C Control the silencer temperature, D Control the cylinder temperature, , 42 Which energy is utilized to hydro electric, power generation using waters?, A Heat energy, B Kinetic energy, C Potential energy, D Magnetic energy, 43 Which statement is unrelated to the hydro, electric power stations?, A Penstock, B Surge tank, C Reservoir, D Small running charge, 44 Which is unrelated for selection of site for, hydro electric power stations?, A Transportation, B Storage of water, C Low capital cost, D Availability of water, 45 What is the purpose of surge tank in a hydro, electric power plant?, A To regulate water flow, B To maintain the water level, C To reduce the pressure in condenser, D To control the water flow in spill ways, 46 What is the purpose of using penstocks in, hydro electric power plant?, A To control water flow, B To maintain water level, C Supply water to turbines, D To regulate water pressure, , - NIMI Question Bank -, , Page5/ 9

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47 What factor is irrelevant for selecting steam, power stations?, A Supply of fuel, B Availability of water, C Availability of exports, D Transportation facilities, , 55 What effect is called heat generating, electricity using solar energy on materials?, A Photovoltaic, B Electrostatic, C Electromotive, D Magnetomotive, , 48 Which apparatus used for nuclear fission in a, nuclear plant?, A Exciter, B Reactor, C Condenser, D Heat exchanger, , 56, A, B, C, D, , 49, A, B, C, D, , Which is the disadvantage of nuclear plant?, Disposal of waste, Low running charges, Plant require by space, Installed near to load entre, , 50 Which material enclose the fuel rods in the, reactor?, A Antimay, B Graphite, C Manganise, D Phospherium, 51, A, B, C, D, , Which reactor used fuel enriched uranium?, BWR, PWR, Berryllium, Graphite reactors, , 52 Which is the disadvantage of heat exchanger, in a pressurized water reactor?, A Heat loss, B Heat regaining, C Heat uncontrollable, D Heat pressure increases, 53 What is used to access the peoples per, capita consumption of energy?, A Education level, B Health standard, C Standard of living, D Per capita income, 54 Which chemical gas is produced while, forming silicon from silica?, A Ammonia, B Nitrogen, C Chlorine, D Carbon dioxide, , What is the main constituent of biogas?, Hydrogen, Nytrogen, Methene, Carbon dioxide, , 57 Which mixture of gases is forming from, animal excrete, vegetable waste and under, go decomposition?, A LPG, B Biogas, C Nitrogen gas, D Hydrogen gas, 58 What is the converting bio mass into liquid, fuels for transportation?, A Bio fuels, B Bio gases, C Bio power, D Bio products, 59 Which energy of the fuel is converted into, mechanical energy into solarcell?, A Heat, B Light, C Kinetic, D Potential, 60 What is the name called for the steam, passed into turbine in a steam/thermal power, station?, A Combusted steam, B Pre heated steam, C Pressurized steam, D Super heated steam, 61 Which is the disadvantage of steam power, plant?, A High lubrication cost, B High maintenance cost, C No continuous over loading, D long manufacturing periods, 62 Which is the disadvantage of diesel plant, over steam plant?, A No ash handling, B Unit cost in more, C No stand by losses, D Installing near to load centre, , - NIMI Question Bank -, , Page6/ 9

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63 Which material used as control rod in a, reactor?, A Mercury, B Thorium, C Tungsten, D Cadmium, 64 What is the function of regenerator in a gas, turbine power plant?, A Supply air, B Heating of air, C Compressing of air, D Cooling of chamber, 65 Which turbine in used for high heads in a, hydro electric power plant?, A Francis turbines, B Impulse turbines, C Kaplam turbines, D Reaction turbines, 66, A, B, C, D, , What is the function of water turbine?, Drains alternator, It controls water flow, Regulate turbine speed, Decides the potential energy, , 67 What is the efficiency of a diesel power plant, over steam power plants?, A Very low, B Very High, C Very poor, D Medium, , - NIMI Question Bank -, , Page7/ 9

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Questions: Level 3, , 8, , 1, , How the heat is produced for making steam, in a nuclear power station?, By fission method, By doping method, Burning the material, By applying pressure, , A, B, C, D, , How the potential energy from water flowing, is converted as kinetic energy to generate, power?, By storing water in high quantity, By using surge tanks at the water canal, By using water turbine to drive alternator, By creating high head through penstocks, , A, B, C, D, , A, B, C, D, 2, , A, B, C, D, 3, A, B, C, D, 4, A, B, C, D, 5, A, B, C, D, 6, , A, B, C, D, 7, A, B, C, D, , What is the effect of radio active rays, produced during nuclear fission?, Damages the reactors, Creates health hazards, Reduces fission process, Enormous heat is produced, What happens to solar cell, if the intensity of, light is low?, Output increases, Output decreases, Output remain same, No output in the cell, What is the output voltage of a solar cell, if, light intensity is high?, No output in the cell, Output voltage is increased, No effect and remain same, Output voltage is decreased, What is the main reason to keep steam, power station far away from populated, areas?, Any time plant will burst, To avoid people’s interference, Because of environmental reasons, To keep the secrecy of plant operations, , 9, , How the disposal of waste in a nuclear, power plant is disposed?, It burnt out, Send for recycling, Dump in open yard, Buried in deep trenches, What is the name called for the process of, breaking nucleus of a heavy atom?, Fusion, Fission, Chain fission, Bombardement, , 10 What is the name called, number of fission, taking place at each successive stage goes, on increasing?, A Chain reaction, B Successive reaction, C Progressive reaction, D Continuous reaction, 11 Which material is the cause for emitting, poisonous radioactive rays during solar cell, fabrications?, A Lead, B Antimony, C Solarium, D Cadmium, 12 How the power is governed in the diesel, power plants?, A Vaying the fuel, B Vaying the voltage, C Controlling the load, D Adding capacitor bank, 13, A, B, C, D, , How the power is produced by wind mills?, Wind mill radiates power, Wind mill drawn generator, Wind mill converts electrical energy, Wind mill blade cuts the wind and produce, power, , How to maintain longer life and better, efficiency of boilers in a steam power plant?, Use soft water, Unless quality coal, Remove ash timely, Reduce size of boiler, , - NIMI Question Bank -, , Page8/ 9

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Module 9 : Power Generation - Key paper, Questions: Level 1, , Questions: Level 2, , Question: Level 3, , SL.No, , Key, , SL.No, , Key, , SL.No, , Key, , SL.No, , Key, , 1, , A, D, A, B, A, A, B, B, C, B, D, D, A, , 1, , A, D, B, B, B, C, C, C, C, A, B, D, D, , 38, , A, D, D, A, B, D, A, A, C, C, B, D, B, , 1, , 12, , C, D, B, B, B, B, D, C, C, A, D, A, , 13, , A, , A, C, A, D, C, C, B, B, C, C, D, D, B, D, C, D, C, A, B, A, C, D, A, B, , 51, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, , B, A, C, C, D, A, A, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, , 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, , - NIMI Question Bank -, , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, , B, B, B, D, A, D, B, B, B, A, D, C, A, C, B, D, B, , Page9/ 9

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Electrician - Semester II - CITS - Module - 10 :, Transmission of Electric Power, U.G Cable & Distribution of Power, Questions: Level 1, 1, A, B, C, , Which electric lines connect the substation, to distributors in distribution system?, Feeders, Distributors, Service lines, , D, , Service mains, , 2, , What is the insulation resistance between any, two conductors in a medium voltage domestic, installation as per IE rules?, , A, B, C, D, , Infinity, More than one Mega ohm, Below than one Mega ohm, More than 100 Mega ohms, , 3, A, , What is diversity factor (D.F)?, DF = minimum actual load, , B, C, , DF =, DF =, , Installed load, Installed load, minimum actual load, minimum installed load, , DF =, , 4, , What is the voltage ratio in A.C distribution, line adopted for domestic consumers?, 415 V/240 V, 240 V/110 V, 415 V/110 V, 11 KV/415 V, , 5, , A, B, C, D, , What is the name of line insulator?, , A, B, C, D, , Pin type insulator, Disc type insulator, Shackle type insulator, Suspension type insulator, , 7, A, B, C, D, , Which is the permissble load for power, circuit in domestic wiring as per IE rules?, 800 W, 1200 W, 2400 W, 3000 W, , 8, , What is the name of the insulator?, , A, B, C, D, , Stay insulator, Shackle insulator, Suspension insulator, Single shed pin insulator, , 9, A, B, C, , Which voltage rate is coming under primary, transmission?, 11 KV, 33 KV, 66 KV, , D, , 220 KV., , 10, , Which voltage rate is coming under, secondary transmission?, 66 KV, 110 KV, 220 KV, 500 KV, , actual load, actual load, , D, , A, B, C, D, , 6, , minimum installed load, , What is the name of the insulator used in, O.H lines?, , Pin insulator, Post insulator, Strain insulator, Shackle insulator, , A, B, C, D, , - NIMI Question Bank -, , Page1/ 8

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11, , Which material is used to make the insulators?, , A, B, C, , Mica, Ceramic, Asbestos, , D, , Parelin clay, , 12, A, B, C, , What is the normal working voltage rate, uses in suspension type insulators?, Beyond 11 KV, Beyond 33 KV, Less than 33 KV, , D, , Less than 11 KV, , 13, , What is the maximum span of wooden pole, can be used for distribution?, Upto 25 meters, Upto 50 meters, Upto 75 meters, Upto 100 meters, , A, B, C, D, 14, , A, B, C, D, 15, , A, B, C, D, , What is the phenomenon known of violet, glow, during noise and producting ozone, gas in a OH transmission line?, Flash, Surge, Corona, Ferranty, What is the maximum percentage of, tolerance is allowed in variation of decleared, voltage in lines medium voltage makes rule, 54?, 5%, 10%, 2.5%, 7.5%, , - NIMI Question Bank -, , Page2/ 8

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Questions: Level 2, , 7, , 1, , A, B, C, , A, B, C, , What is the reason for the conductor crosssectional area can fully utilised on, transmission of DC as compared to AC?, No heat loss, No skin effect, No power loss, , What is the reason of keeping binding wire, gap too close and very tight in pin insulator?, Avoid sparking, Avoid corrosion, Avoid oxide formation, , D, , Avoid atmospheric pressure, , 8, , D, , No corona loss, , 2, , Why the disc pin insulators outer surface is made, by glazing and bent the sides inward?, , A, B, C, , What is the name of conductor used on, overhead lines??, ACSR, Aluminium, Galvanised iron, , A, B, C, D, , To withstand high voltage, Not to attract birds to sit on it, To offer high mechanical strength, Disables continuous water flow in rainy, season, , 3, , What is the type of over head line joint?, , D, , Hard drawn copper, , 9, , What is the main purpose of cross arm used in, electric poles?, , A, B, C, , Supporting the line conductors, Holding the insulators on overhead line, Avoids short circuit between conductors, , D, , Reduces conductor sag between supports, , 10, , Which type of line insulator is used at the dead, ends of the H.T overhead lines?, , A, B, C, D, , Pin insulator, Disc insulator, Stay insulator, Post insulator, , 11, , What is the advantage of AC power, transmission?, Corona loss negligible, Stress on transmission lines is minimum, Low voltage drop in transmission lines, , A, B, C, , Twisted joint, Straight sleeve joint, Compression joint for ACSR, , D, , Straight joint through connectors, , 4, A, B, C, , Why steel is reinforced in ACSR conductors, used for over head lines?, To minimize the line sag, To reduce the line voltage drop, To increase the tensile strength, , A, B, C, D, , Voltages can be stepped up and stepped down, easily, , D, , To increase the current carrying capacity, , 5, , What is ACSR stands for?, All Conductors Steel Reinforced, Aluminium Core Steel Reinforced, Aluminium Covered Steel Reinforced, Aluminium Conductor Steel Reinforced, , 13, , A, B, C, , Which type of A.C transmission is, universallly adopted?, Two phase four wire, Two phase three wire, Single phase two wire, Three phase three wire, Which type of line insulator is used for, terminating on corner post?, Pin insulator, Strain insulator, Shackle insulator, , 12, A, B, C, D, , What is the purpose of cross-arm in O.H, lines?, Provide more support to the O.H pole, Protect from short between conductors, Reduce the sag of the lines between poles, , D, , Suspension insulator, , A, B, C, D, 6, , A, B, C, D, , Holding the insulators were the conductors are, fastened, , - NIMI Question Bank -, , Page3/ 8

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14, A, B, C, D, 15, , What is the advantage of over head lines, compared to underground cable?, Public safety is more, Faults can be located easily, No interference with the communication, lines, Not liable to the hazards from lightning, discharges, Which type of lightning arrester?, , A, B, C, , Rod gap arrester, Horn gap arrester, Multi gap arrester, , D, , Expulsion type arrester, , 16, , Which type of lightning arrester is used for, only for backup protection?, Rod gap arrester, Horn gap arrester, Multi gap arrester, Valve type arrester, , A, B, C, D, 17, , A, B, C, , Which substation the transmission line, voltage is stepped down to consumer supply, voltage?, Mobile substation, Mining substation, Secondary substation, , D, , Distribution substation, , 18, A, B, C, , Which insulation material is limited use to, provide insulation to UG cables?, Impregnated paper, Varnished cambric, Rubber mineral compound, , D, , Plastic coated PVC sheets, , 19, , What is the purpose of providing metallic, sheets in UG cables?, Protection from heat, Protection from ageing, Protection from moisture, Protection from mechanical damages, , A, B, C, D, , 20, A, B, C, D, 21, A, B, C, D, , What is the advantage of UG cable, compared to OH line transmission?, No lightening hazards, Faults can be detected easily, Easy to extend the lines, Less material cost, What is the electrical switch gear?, Load control switch, Switching device, Distribution analyser, AC production control, , 22, , How to make contact pressure in pantograph, isolator?, , A, B, C, D, , Automatic lever control, By using counter weight, Motorised contact setting, Disc springs arrangement, , 23, , What is the current and voltage in a short, circuited condition?, , A, B, C, D, 24, A, B, C, D, , Both current and voltage is zero, Both current and voltage is same, Current is zero and voltage is maximum, Voltage is zero and current is maximum, What is the function of Lightening arrestor?, Protection against surges, Controls high current in line, Protection of line from earthing, Providing voltage regulation in line, , 25, , What is the name called the cable, connected between distributors and, consumer load terminal?, Load line, Power line, Supply line, Service line, , A, B, C, D, 26, A, B, C, D, 27, A, B, C, D, , Which is disadvantage of DC over AC, transmission?, More corona loss, Cannot generate high voltage, Requires more space, More line losses, Which is considered as a advantage of DC, over AC for transmission?, No skin effect, High DC voltage can be generated, Frequency related circuits can be used, Step-up or step down using transformer is, possible, , - NIMI Question Bank -, , Page4/ 8

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Which is an advantage of AC over DC for, transmission?, Less corona loss, Less voltage drop, Can be step-up and step down easely, Less line loss, , 35, , 36, , A, B, C, D, , Which device converts high power high, voltage AC to DC conventional for, transmission?, Zener diodes, PN junction diodes, High power inverter, Mercurry arc rectifies, , 30, A, B, C, D, , What is the effect of corona in the line?, No voltage regulation, Line frequency will reduce, Transmission efficiency reduces, Lightening charges are increased, , 31, , What is the effect on conductor. If the, ozone produced by corona?, Reduce resistance, Increase resistance, Reduce tensile strength, Corrossion due to chemical action, , 28, A, B, C, D, 29, , A, B, C, D, 32, , A, B, C, D, 33, , A, B, C, D, 34, A, B, C, D, , What is the name called the difference in, level between points of supports and the, lower point of the conductor?, Sag of the conductor line, Distance of the conductor, Tensile strength of conductor, Clearance of the conductor line, What is the term called the difference in, voltage at receiving end and sending end, expressed in percentage in a transmission, line?, Line constant, Line regulation, Voltage regulation, Transmission regulation, , A, B, C, D, , A, B, C, D, 37, A, B, C, D, 38, A, B, C, D, 39, A, B, C, D, , What is the advantage of ring main, distribution system?, Less voltage fluctuation, direct access of distribution, Increases efficiency of the system, Increase service reliability, Where the earth switch is connected in a, substation?, Between isolator switch and earth, Between earth and uncharged conductor, Between power transmission terminal and, earth, Between uncharged conductor and, lightening arrestor, Which cooling method used to a 11KV /, 440V distribution transmission?, Natural air cooling, Air blast oil cooling, Oil natural air natural, Water cooling method, Which electric lines connect generating, station to distributors?, Feeders, Power lines, Service lines, Distribution lines, What is the advantage of high voltage AC, transmission?, Reduce power, Reduce current, Reduce resistance, Increase power factor, , What is the function of relay in a switchgear, protection circuit?, Control the circuit current, Regulate the voltage, To detect the fault in circuit, Protect the circuit, , - NIMI Question Bank -, , Page5/ 8

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Questions: Level 3, , 7, , 1, , What happens to the string arrangement of, disc insulators, if one of the disc insulator, gets damaged?, Whole string become useless, No effect operates normally, Only the damaged disc will not function, , A, B, C, D, 8, , What is the process of mixing pure rubber with, mineral mattes and sulphur?, , D, , Damaged insulator and the adjacent insulator will, not function, , 2, , How the sparking on the aluminium cored, conductors binding joints can be prevented?, , A, B, C, D, , Annealing, Compounding, Impregnating, Vulcanizing, , A, B, C, D, , Keeping binding turns very close, Making binding turns very tight, Providing guard wires below the conductors, Providing more than one binding, , 9, , 3, , D, , To maintain maximum insulation, , 10, , Why the belt is provided in the belted cables?, , A, B, C, , What happens to the skin effect on the O.H, conductors, if the conductor diameter is, small (<1cm)?, Becomes negligible, Increases to maximum, No effect, remain same, , A, B, C, , Why the VIR insulation is generally used, tinned copper conductor?, To prevent electrical fire, To avoid chemical reaction, To reduce electrical losses, , D, , Decreases half of the value, , A, B, C, D, , 4, , What is the effect, if the test button marked as ‘X’, is closed permanently in ELCB?, , Protection of leakage current, Preventing conductor temperature, Housing the core material in tight condition, Providing insulation and protection from, moisture, , 11, , What will happen, if the tangertial stresses, set up in paper insulation beyond 22 KV in a, belted cable?, Causes leakage current, Causes insulation failure, Breaks the cable immediately, Causes short circuits instantaneously, , A, B, C, , A, B, C, D, ‘X’, , 12, , A, B, C, , Circuit trips intermittently, Circuit functions normally, Circuit switch off completely, , D, , Circuit will not trip on leakage, , 5, A, B, C, , What is the defect in an air circuit breaker, if, trips intermittenly on loading?, Incorrect setting of relay, Excessive heat, Insufficient air pressure, , D, , Line voltage is too high, , 6, , What is the defect in oil circuit breaker, if the oil, heats up excessively?, , A, B, C, , Line voltage is too high, Excessive load, Poor dielectric strength, , D, , Defective tripping mechanism, , A, B, C, D, 13, A, B, C, D, 14, A, B, C, D, , What is the cause for the defect if phase to, ground fault on the transmission line?, Components failure, Insulation failure, Skin effect, Fuse failure, , Why isolator always to be operated after, circuit breaker is opened?, To share the load current, To reduce the breaking line, To avoid huge area quenching, To avoid contact damage, What is the intention of glazing the line, insulators in OH lines?, To provide good loading, Avoid birds to set on them, Avoid absorption of moisture, To increase mechanical strength, Which is unrelated to the property of pin, insulator in H.V.T transmission lines?, High ratio of puncture, High dielectric strength, High mechanical strength, High brittle resist capacity, , - NIMI Question Bank -, , Page6/ 8

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15, A, B, C, D, 16, A, B, C, D, 17, A, B, C, D, 18, A, B, C, D, 19, , A, B, C, D, , What will happen, if the pin insulator is, porous, lot of impurition and cracks?, Lowers the permitivity, Lower the dielectric strength, Lowers the electrical resistance, Reduce the ratio of puncture strength, Why the steel tower footings are usually, grounded by driving rods?, Prevents surges, Carry high voltage, Minimize lightening troubles, Maintain constant voltage in line, What situation OH lines are surrounded by a, faint violet glow formed?, Too much of voltage surges, Size of conductor very small, Not used stranded conductors, Voltage exceeds critical disruptive level, Which is to be considered to reduce corona, effect?, Regulate power utilisation, Maintain line voltage constant, Reduce the electro static stresses, Increase the electro static stresses, Which fault in power system is no longer, present if, power is disconnected for a short, time?, Transient line fault, Persistant line fault, Symmetric line fault, Asymmetric fault, , - NIMI Question Bank -, , Page7/ 8

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Module - 10 :Transmission of Electric Power, U.G Cable &, Distribution of Power - Key paper, Questions: Level 1, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, , Key, , A, B, A, A, D, D, D, D, D, A, B, B, B, A, B, , Questions: Level 2, SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, , Key, , B, D, C, C, D, C, A, A, B, B, D, D, D, B, A, A, D, C, B, A, B, D, A, A, D, B, A, C, C, C, D, A, C, C, A, A, , SL.No, 37, 38, 39, , - NIMI Question Bank -, , Question: Level 3, Key, , B, A, B, , SL.No, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, , Key, , C, B, A, C, A, C, B, D, B, D, A, C, C, D, D, C, A, C, A, , Page8/ 8