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1305/314, , PLUMBING CRAFT THEORY, June/July 2019, , Time: 3 hours, , THE KENYA NATIONAL EXAMINATIONS COUNCIL, CRAFT CERTIFICATE IN PLUMBING, , PLUMBING CRAFT THEORY, , 3 hours, , INSTRUCTIONS TO CANDIDATES, , You should have the following for this examination:, Answer booklet;, Drawing instruments;, Mathematical tables/calculator., , This paper consists of EIGHT questions., , Answer FIVE questions., , ALL questions carry equal marks., , Maximum marks for each part of the question are indicated., , Candidates should answer the questions in English., , This paper consists of 4 printed pages., , Candidates should check the question paper to ascertain that, all the pages are printed as indicated and that no questions are missing., , ©2019 The Kenya National Examinations Council, , , , , , ‘Turn over, , easytvet.com, , =e

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1, (a), (b), , |, , easytvet.com, , List four items found in a first aid kit, (2 marks), , State two precautions to be observed when using each of the following tools:, , G) chisel;, (ii) hammer;, ve (ii) hacksaw. (6 marks), , (c), , (d), , 2. (a), , (b), , (c), , (d), , 3. (a), , (b), , {e), , 1305/314, SunietIuly 2019, , Sketch the following tools used in plumbing works, stating one use for each:, , (i) fixed jaw basin wrench;, (ii) straight pein hammer. (6 marks), , With the aid of a sketch, describe the hydrological cycle. (6 marks), (i) _ List four sources of water., , {ii) State four impurities that make water unsuitable for drinking. (4 marks), Explain the following processes of water treatment:, , i) filtration; Fe, Gi) coagulation. S, , Describe the following fire fighting systems: ~~., , , , (i) wet riser; <= :, (ii) dry riser, (4 marks), , Outline the procedure of cutting a thread on a steel pipe using stocks and dies., (8 marks), , Differentiate between ferrous metals and non-ferrous metals giving one example in, each case. (4 marks), , {i) State four advantages of direct cold water supply system., , (ii) ___Sketch and Jabel a section through a domestic cold water storage cistern, : indicating positions of all connections. (10. marks), , Explain the following types of flows in pipes:, (i) steady flow;, , (ii) turbulent flow;, (iii) laminar flow. (6 marks), , }, \, f, :, {, }

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easytvet. CO!, 4. (a) State four factors considered when selecting a pump for water supply. (4 marks), , (b) With the aid of a labelled sketch, explain the working principles of a reciprocating, pump. (8 marks), , (c) Distinguish between ‘separate system‘ and ‘combined system! of drainage. {4 marks), (d) State the metal composition of the following alloys:, , (i) brass; ., (ii) bronze. {4 marks), , as (a) @ State four precautions observed when using gas welding equipment., , (ii) With the aid of sketches, describe two types of oxy-acetylene welding flames., (10 marks), , (b) State four defects in arc welding. Pie GE (2 marks), , {c) _ Hlustrate the following welded joints: fs, , (i) butt joint;, (ii) angle joint;, (iii) tap joint. (6 marks), , , , (d) _ State two precautions observed when installing a gas system ina building, (2 marks), 6. fa) Explain the working of instantaneous electrical water heater, (2 marks), , (b) Illustrate the direct hot water system indicating the direction of flow of water., (6 marks), , (c) State one function of each of the following components in pipework giving two, examples of each:, , fi) valves;, Gi) aps. (4 marks), , (a) (i) Explain the term furring as sued in hot water systems stating two of it’s effects., , Gi) Sketch and tabel a direct solar water heating system. (8 marks)

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a, , (b), (c), Sta), (b), (c), , (d), , 1305/314, ume july 2019, , Gasytvet.com, , i) State four materials used for sanitary appliances., , (ii) Differentiate between waste appliances and soil appliances giving two examples, in each case. (10 marks), , State four items considered when estimating the cost of plumbing works. (4 marks), , Sketch and label a detail of the flashing at a roof valley. (6 marks), State five locations where manholes are provided in a drainage system. (3 marks), Sketch and label a section through a soakway. (5 marks), , With reference to setting out of drains, state:, , (i) two instruments used;, (ii) two pieces of equipment used. (2 marks), , Explain four causes of loss of water seal in traps, (8 marks), , THIS IS THE LAST PRINTED PAGE.