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<=Craft Certificate in Plumbing: Plumbing Craft Theory past paper March 2023
Explain the function of each of the following devices:
(i) float switch;
(ii) safety valve;
(iii) air valve
(i) float switch;
(ii) safety valve;
(iii) air valve
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Questions List:
1. Define 'heat treatment'
2. State four objectives achieved by heat treatment
3. Explain the function of each of the following devices: (i) float switch; (ii) safety valve; (iii) air valve
4. Sketch and label a one pipe system of the above ground drainage
5. Outline four causes of a water pump failure
6. Sketch and label a petrol interceptor
7. Outline four faults in arc-welded joints
8. Explain the following water treatment processes: (i) removal of hardness using base-exchange; (ii) removal of suspended matter in water; (iii) removal of odour in water
9. Sketch and label an indirect hot water system in a domestic dwelling
10. Outline two safety precautions observed in a plumbing workshop in relation to each of the following: (i) use of electric machines; (ii) floor layout; (iii) personal protection equipment
11. Illustrate two situations through which a drainage trap loses water seal due to siphonage
12. State three design principles of the below ground drainage
13. Sketch the following tools used in plumbing: (i) pipe reamer; (ii) pipe vice
14. Sketch and label a direct cold water supply System in a domestic dwelling
15. Sketch and label the connection of waste water pipe from a wash hand basin fixed to an external wall on the ground floor to a drain pipe
16. List four sources of water used in fire fighting
17. Sketch the following pipe supports:(8 marks) (i)build-in clip; (ii)saddle clip.
18. State four uses of flux
19. Explain each of the following tests carried out on newly laid drains: (ii)alignment test; (ii)obstruction test; (iii)smoke test
20. State two functions of a stop cock
21. State four advantages of thermal insulation
22. Sketch the dry riser firefighting system and explain its operation
1. Define 'heat treatment'
2. State four objectives achieved by heat treatment
3. Explain the function of each of the following devices: (i) float switch; (ii) safety valve; (iii) air valve
4. Sketch and label a one pipe system of the above ground drainage
5. Outline four causes of a water pump failure
6. Sketch and label a petrol interceptor
7. Outline four faults in arc-welded joints
8. Explain the following water treatment processes: (i) removal of hardness using base-exchange; (ii) removal of suspended matter in water; (iii) removal of odour in water
9. Sketch and label an indirect hot water system in a domestic dwelling
10. Outline two safety precautions observed in a plumbing workshop in relation to each of the following: (i) use of electric machines; (ii) floor layout; (iii) personal protection equipment
11. Illustrate two situations through which a drainage trap loses water seal due to siphonage
12. State three design principles of the below ground drainage
13. Sketch the following tools used in plumbing: (i) pipe reamer; (ii) pipe vice
14. Sketch and label a direct cold water supply System in a domestic dwelling
15. Sketch and label the connection of waste water pipe from a wash hand basin fixed to an external wall on the ground floor to a drain pipe
16. List four sources of water used in fire fighting
17. Sketch the following pipe supports:(8 marks) (i)build-in clip; (ii)saddle clip.
18. State four uses of flux
19. Explain each of the following tests carried out on newly laid drains: (ii)alignment test; (ii)obstruction test; (iii)smoke test
20. State two functions of a stop cock
21. State four advantages of thermal insulation
22. Sketch the dry riser firefighting system and explain its operation
