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OBJECTIVE TYPE QUESTIONS, QUESTIONS, Tick mark (V) the most appropriate statement of the multiple choice answers :, 1. An ideal fluid is defined as the fluid which, 10. Surface tension has the units of, (a) is compressible, (b) is incompressible, (c) is incompressible and non-viscous (invis-, cid), (d) has negligible surface tension., 2. Newton's law of viscosity states that, (a) shear stress is directly proportional to, the velocity, (b) shear stress is directly proportional to, velocity gradient, (c) shear stress is directly proportional to, shear strain, (a) force per unit area, (b) force per unit length, (c) force per unit volume, (d) none of the above., 11. The gases are considered incompressible, when Mach number, (a) is equal to 1.0, (c) is more than 0.3 (d) is less than O.2., 12. Pascal's law states that pressure at a point is, (b) is equal to 0.50, equal in all directions, (a) in a liquid at rest, (b) in a fluid at rest, (d) shear stress is directly proportional to, the viscosity., (c) in a laminar flow, (d) in a turbulent flow., 3. A Newtonian fluid is defined as the fluid which, (a) is incompressible and non-viscous, (b) obeys Newton's law of viscosity, (c) is highly viscous, (d) is compressible and non-viscous., 4. Kinematic viscosity is defined as equal to, (a) dynamic viscosity x density, (b) dynamic viscosity/density, (c) dynamic viscosity x pressure, (d) pressure x density., 5. Dynamic viscosity (u) has the dimensions as, (a) MLT-2, (c) ML-'T-2, 6. Poise is the unit of, 13. The hydrostatic law states that rate of increase, of pressure in a vertical direction is equal to, (a) density of the fluid, (b) specific weight of the fluid, (c) weight of the fluid, (d) none of the above., 14. Fluid statics deals with, (a) viscous and pressure forces, (b) viscous and gravity forces, (c) gravity and pressure forces, (d) surface tension and gravity forces., 15. Gauge pressure at a point is equal to, (a) absolute pressure plus atmospheric pres-, (b) ML-' T-', (d) M-'L- T-, (a) mass density, (b) kinematic viscosity, (c) viscosity, (d) velocity gradient., 7. The increase of temperature, (a) increases the viscosity of a liquid, (b) decreases the viscosity of a liquid, (c) decreases the viscosity of a gas, (d) increases the viscosity of a gas., 8. Stoke is the unit of, (a) surface tension, (b) viscosity, (c) kinematic viscosity, (d) none of the above., 9. The dividing factor for converting one poise, into MKS unit of dynamic viscosity is, sure, (b) absolute pressure minus atmospheric, pressure, (c) vacuum pressure plus absolute pressure, (d) none of the above., 16. Atmospheric pressure held in terms of water, column is, (b) 8.5 m, (d) 10.30 m., (а) 7.5 m, (c) 9.81 m, 17. The hydrostatic pressure on a plane surface is, equal to, (a) wAh, (b) wAh sin? 0., –wañ, (d) wAh sin 0., (c), (a) 9.81, (c) 981, (b) 98.1, (d) 0.981., where A = Area of plane surface, and, h = Depth of centroid of the plane area below, the liquid-free surface., Scanned by CamScanner

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24. The metacentric height of a floating body is, (a) the distance between metacentre and, centre of buoyancy, (b) the distance between the centre of buoy-, ancy and centre of gravity, (c) the distance between metacentre and, centre of gravity, (d) none of the above., 25. The necessary condition for the flow to be, steady is that, (a) the velocity does not change from place, to place, (b) the velocity is constant at a point with, respect to time, (c) the velocity changes at a point with re-, 18. Centre of pressure of a plane surface immersed, in a liquid is, (a) above the centre of gravity of the plane, surface, (b) at the centre of gravity of the plane surface, (c) below the centre of gravity of the plane, surface, (d) none of the above., 19. The resultant hydrostatic force acts through a, point known as, (a) centre of gravity, (b) centre of buoyancy, (c) centre of pressure, (d) none of the above., 20. For a submerged curved surface, the vertical, component of the hydrostatic force is, (a) mass of the liquid supported by the, curved surface, spect to time, (d) none of the above., 26. The necessary condition for the flow to be, uniform is that, (b) weight of the liquid supported by the, (a) the velocity is constant at a point with, respect to time, (b) the velocity is constant in the flow field, with respect to space, (c) the velocity changes at a point with re-, spect to time, (d) none of the above., 27. The flow in pipe is laminar if, (a) Reynolds number is equal to 2500, (b) Reynolds number is equal to 4000, (c) Reynolds number is more than 2500, (d) none of the above., 28. A stream line is a line, curved surface, (c) the force on the projected area of the, curved surface on vertical plane, (d) none of the above., 21. For a floating body, the buoyant force passes, through the, (a) centre of gravity of the body, (b) centre of gravity of the submerged part, of the body, (c) metacentre of the body, (d) centroid of the liquid displaced by the, body., (a) which is along the path of a particle, (b) which is always parallel to the main di-, 22. The condition of stable equilibrium for a float-, ing body is, (a) the metacentre M coincides with the cen-, tre of gravity G, (b) the metacentre M is below centre of grav-, ity G, (c) the metacentre M is above centre of, gravity G, (d) the centre of buoyancy B is above centre, of gravity G., rection of flow, (c) across which there is no flow, (d) on which tangent drawn at any point, gives the direction of velocity., 29. Continuity equation can take the form, (a) A, V, = A2 V2, (b) P, A, = P2 A2, (c) P, A, V, = P2 A2 V2, (d) P, A, V, = P2 A2 V2., 30. Pitot-tube is used for measurement of, %3D, %3D, %3D, 23. A submerged body will be in stable equilib-, rium if, (a) the centre of buoyancy B is below the, centre of gravity G, (b) the centre of buoyancy B coincides with G, (c) the centre of buoyancy B is above the, (a) pressure, (b) flow, (c) velocity at a point, (d) discharge., 31. Bernoulli's theorem deals with the law of con-, servation of, metacentre M, (a) mass, (c) energy, (b) momentum, (d) none of the above., (d) the centre of buoyancy B is above G., Scanned by CamScanner

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32. Continuity equation deals with the law of, conservation of, (a) L4 v2, P৪ 28, v2, (b), 28, (b) momentum, (d) none of the above., (a) mass, (c) energy, 33. Irrotational flow means, (a) the fluid does not rotated while moving, (b) the fluid moves in straight lines, (c) the net rotation of fluid particles about, v2, or?, (d), 28, (c), x2g, 39. Bernoulli's equation is derived making, assumptions that, (a) the flow is uniform and incompressible, (b) the flow is non-viscous, uniform and, steady, (c) the flow is steady, non-viscous, incom-, pressible and irrotational, (d) none of the above., 40. The Bernoulli's equation can take the form, their mass centre is zero, (d) none of the above., 34. The velocity components in x and y directions, in terms of velocity potential (4) are, (а) и %3D, Əx, ду, v?, PI, (b), ду, ax, (a) Pl+, P2 V, +Zz, +Z,, 28, P2, 28, (с) и -, Əx, ду, (b), PI8, +Z, =, P28, P2, +Zz, 2, (d) и -, ax, ду, 35. The velocity components in x and y directions, in terms of stream function (y) are, PL +, (c), P2, 8Z, =, P28 28, v, + gZ2, P18 28, (а) и %3D, ax, Pi, P2, +Z, =, P28 28, 41. The flow rate through a circular pipe is, ду, (d), + Zz., +, P18 28, (6) и %3D, ax, dy, measured by, (a) Pitot-tube, (c) Orifice-meter, (b) Venturimeter, (d) None of the above., (c), ду, dx, 42. The range for co-efficient of discharge (C) for, a venturimeter is, V =, ax, 36. The relation between tangential velocity (V), (d) u:, dy, (a) 0.6 to 0.7, (c) 0.8 to 0.9, 43. The co-efficient of velocity (C,) for an orifice is, (b) 0.7 to 0.8, (d) 0.95 to 0.99., and radius (r) is given by, (a) V x r = Constant for forced vortex, (b) V/r = Constant for forced vortex, (c) Vxr = Constant for free vortex, (d) V/r = Constant for free vortex., 37. The pressure variation along the radial, direction for vortex flow along a horizontal, 4x, (а) С, 3D, yH, 2x, (b) C, =, VAyH, (с) С, -, (d) none of the above., 4уН, plane is given as, 44. The co-efficient of discharge (C,) in terms of, C, and C, is, y2, V, (a), ar, (b), ar, (а) Са, (b), Ca = C, x C., C., y2, (c), ar, (d) none of the above., (c) Ca=, C,, (d) none of the above., 38. For a forced vortex flow, the height of, 45. An orifice is known as large orifice when the, head of liquid from the centre of orifice is, paraboloid formed is equal to, Scanned by CamScanner

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52. For the laminar flow between two parallel plates, (a) the maximum velocity = 2.0 times the, (a) more than 10 times the depth of orifice, (b) less than 10 times the depth of orifice, (c) less than 5 times the depth of orifice, (d) none of the above., average velocity, (b) the maximum velocity = 2.5 times the, average velocity, (c) the maximum velocity = 1.33 times the, average velocity, (d) none of the above., 53. The value of the kinetic energy correction factor, (a) of the viscous flow through a circular pipe is, (a) 1.33, (c) 2.0, 54. The value of the momentum correction factor (B), for the viscous flow through a circular pipe is, (а) 1.33, (c) 2.0, 55. The pressure drop per unit length of a pipe for, laminar flow is, 46. Which mouthpiece is having maximum co-, efficient of discharge, (a) external mouthpiece, (b) convergent-divergent mouthpiece, (c) internal mouthpiece, (d) none of the above., 47. The co-efficient of discharge (Ca), (b) 1.50, (d) 1.25., (a) for an orifice is more than that for a, mouthpiece, (b) for internal mouthpiece is more than that, for external mouthpiece, (c) for a mouthpiece is more than that for an, (b) 1.50, (d) 1.25., orifice, 12µŪL, PgD?, 12µŪ, P&D², (d) none of the above., 48. A flow is said to be laminar when, (a) equal to, (b) equal to, (a) the fluid particles moves in a zig-zag way, (b) the Reynolds number is high, (c) the fluid particles move in layers parallel, 32μL, PgD?, 56. For viscous flow between two parallel plates,, the pressure drop per unit length is equal to, (c) equal to, (d) none of the above., to the boundary, (d) none of the above., 49. For the laminar flow through a circular pipe, (a) the maximum velocity = 1.5 times the, average velocity, (b) the maximum velocity = 2.0 times the, 12µŪL, 12μUL, (b), D2, (a), P&D², 32μL, D2, 12μυ, (c), (d), D2, average velocity, (c) the maximum velocity = 2.5 times the, 57. The velocity distribution in laminar flow, through a circular pipe follow the, (a) parabolic law, (c) logarithmic law (d) none of the above., 58. A boundary is known as hydrodynamically, smooth if, average velocity, (d) none of the above., 50. The loss of pressure head for the laminar flow, through pipes varies, (a) as the square of velocity, (b) directly as the velocity, (c) as the inverse of the velocity, (d) none of the above., 51. For the laminar flow through a pipe, the shear, (b) linear law, k, *, (6) >0., k, -> 0.3, 8', (a), = 0.3, 8', k, <0.25, k, (d), = 6.0, where k = Average height of the irregularities, from the boundary, and 8 = Thickness of laminar sub-layer., %3D, stress over the cross-section, (a) varies inversely as the distance from the, centre of the pipe, 59. The co-efficient of friction for laminar flow, through a circular pipe is given by, (b) varies directly as the distance from the, surface of the pipe, (c) varies directly as the distance from the, centre of the pipe, 0.0791, 16, (b) f=, R., (a) f=, 64, (c), (d) none of the above., (d) remains constant over the cross-section., R., Scanned by CamScanner

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60. The loss of head due to sudden expansion of a, pipe is given by, 66. The valve closure is said to be gradual if the, time required to close the valve, (a) h̟ =, 28, (b) h., 28, 0.5 v, 2L, (a) t=, C, 2L, (b) iS, C, %3D, (V, – v,)², (c) h̟=, 4L, (c) t<, C, 2L, (d) i>, C, (d) none of the above., 28, where L = Length of pipe, C = Velocity of, %3D, 61. The loss of head due to sudden contraction of, pressure wave., 67. The velocity of pressure wave in terms of bulk, modulus (K) and density (p) is given by, a pipe is equal to, » (1-%, (a), (b), 2g, 28, (a) C=, K, (b) C= Kp, K, (с) С%-, P, (c), (d) none of the above., 28, (d) none of the above., 62. Hydraulic gradient line (H.G.L.) represents, 68. Reynold's number is defined as the, (a) ratio of inertia force to gravity force, (b) ratio of viscous force to gravity force, (c) ratio of viscous force to elastic force, (d) ratio of inertia force to viscous force., 69. Froude's number is defined as the ratio of, the sum of, (a) pressure head and kinetic head, (b) kinetic head and datum head, (c) pressure head, kinetic head and datum, head, (d) pressure head and datum head., 63. Total energy line (T.E.L.) represents the sum of, (a) pressure head and kinetic head, (b) kinetic head and datum head, (c) pressure head and datum head, (d) pressure head, kinetic head and datum, head., (a) inertia force to viscous force, (b) inertia force to gravity force, (c) inertia force to elastic force, (d) inertia force to pressure force., 70. Mach number is defined as the ratio of, (a) inertia force to viscous force, (b) viscous force to surface tension force, (c) viscous force to elastic force, (d) inertia force to elastic force., 64. When the pipes are connected in series, the, total rate of flow, (a) is equal to the sum of the rate of flow in, each pipe, (b) is equal to the reciprocal of the sum of, the rate of flow in each pipe, (c) is the same as flowing through each pipe, (d) none of the above., 65. Power transmitted through pipes, will be maxi-, 71. Euler's number is the ratio of, (a) inertia force to pressure force, (b) inertia force to elastic force, (c) inertia force to gravity force, (d) none of the above., 72. Models are known undistorted model if, (a) the prototype and model are having, different scale ratios, mum when, 1, (a) head lost due to friction = - total head at, (b) the prototype and model are having same, scale ratio, 2, inlet of the pipe, (c) model and prototype are kinematically, 1, total head at, 4, similar, (b) head lost due to friction =, (d) none of the above., 73. Geometric similarity between model and pro-, inlet of the pipe, (c) head lost due to friction = total head at, the inlet of the pipe, totype means, (a) the similarity discharge, (b) the similarity of linear dimensions, (c) the similarity of motion, (d) the similarity of forces., (d) head lost due to friction =, 1, total head, at the inlet of the pipe., Scanned by CamScanner