Craft Certificate in Plumbing: Plumbing Craft Theory past paper July 2020 Answers

Answers for Craft Certificate in Plumbing: Plumbing Craft Theory past paper July 2020

Course Name:  Plumbing
Also Done By:
na
Course Level:  Craft Certificate
Sub Level:       Module I
Course Unit:   Plumbing Craft Theory
Exam body:    KNEC
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1. State four safety precautions observed in relation to tools and equipment ()
2. State four classes of tools used in plumbing and name one example of each ()
3. Define the following properties of metals: (i) ductility: (ii) malleability ()
4. Explain the procedure of hot bending a PVC pipe ()
5. Distinguish between permanent hardness and temporary hardness in water ()
6. Explain the 'base exchange' process ()
7. Outline four disadvantages of the direct system of cold water supply ()
8. With the aid of sketches, illustrate four welding joints ()
9. Explain the following terms as used in cold water supply: (i)cistern; (ii)waterline; (iii)communication pipe; (iv) distributing pipe ()
10. Differentiate between a stop valve and a gate valve ()
11. Differentiate between brazing and soldering ()
12. Explain two components of an arc welding machine ()
13. Explain the purpose of the following components in gas installation: (1)meters; (ii)condensate receiver ()
14. Outline four properties of insulating materials for hot water systems ()
15. Explain four advantages and one disadvantage of the centralized water heating system ()
16. Outline three methods of roof drainage ()
17. State two steam system components and give one use of each ()
18. Sketch a labeled vertical section through a rainwater shoe ()
19. Explain three systems of solar water heating ()
20. Explain the functions of the following pump components: (i)suction valves; (ii) strainers; (iii)priming devices; (iv) float switches ()
21. State the two requirements in relation to the termination of stacks ()
22. State two disadvantages of resealing and anti-siphon traps ()
23. State where the following stack diameters are suitable in a single stack system: (1)75 or 89 mm diameter; (II)100 mm diameter; (III)125 mm diameter; (IV)150 mm diameter ()
24. Outline four design requirements of a single stack system ()
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