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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. Outline how safety is observed in each of the following (i)clothing, (ii) behaviour, (iii) self care; (iv)storage of tools. ()
2. Sketch and label the following plumbing hand tools. (i)hacksaw, (ii) pipe reamer. ()
3. Differentiate between ferrous and non-ferrous metals, stating two examples in each case. ()
4. State: (i)the chemical name of water (ii)the chemical symbol of water ()
5. Name three major sources of water ()
6. Outline four design principles of direct system of hot water supply. ()
7. Differentiate between a tap and a valve in plumbing installations ()
8. Define the term alloy ()
9. Describe the following alloys: (i) brass, (II)bronze ()
10. Explain the following water treatment processes: (i)screening, (ii)sedimentation, (iii)chlorination ()
11. With the aid of a labeled sketch, explain the operation of a double trap siphonic water closet. ()
12. Sketch and label a single stack drainage system. ()
13. Name three types of gas welding flames. ()
14. With the aid of labeled sketches, differentiate between rightward and leftward gas welding techniques ()
15. Name four gas welding defects ()
16. Calculate the power output of a centrifugal pump which can lift 200 litres of water from a shallow well 6 m deep in 10 seconds. ()
17. Name two physical and chemical properties of water. ()
18. Sketch and label an indirect hot water supply system for a domestic house ()
19. Outline four reasons for are welding electrode coating. ()
20. Sketch and label an alternating current arc welding set ()
21. Describe the procedure of tinning a soldering bit. ()
22. State four positions where manholes are used in drainage systems. ()
23. List two reducing agents used in water treatment. ()
24. Outline the four properties of a coagulant. ()
25. Outline four characteristics of below ground drainage system. ()