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Mechanic Refrigeration & Air Conditioning Practice Test: Water Treatment
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Mechanic Refrigeration & Air Conditioning Practice Test: Water Treatment
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25 Questions

1. The methods used for biological treatment are
2. Which of the following substances are commonly used in a filter?
3. The maximum desirable limit (BIS of mercury in the drinking water is
4. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
5. Coliform bacteria in water is an indication of the presence of
6. Lagoons may be characterized as
7. Permanent hardness of water may be removed by the addition of
8. The ultimate source of water is
9. Permanent hardness of water is caused by the presence of
10. The purest form of naturally occurring water is
11. Permanent hard water may be softened by passing it through
12. Which of the following chemical is sometime added in the process of coagulation and flocculation?
13. Calgon is used for removal of
14. Zeolite softening process removes
15. Hardness of water does not
16. When temporary hard water is boiled, one of the substances formed is
17. Temporary hardness of water is caused by the presence of
18. The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is
19. Application of quaternary ammonium compounds as sanitizing agents tends to
20. The chemical oxygen demand (COD)measures the
21. The maximum permissible limit (BIS) of turbidity in drinking water is
22. Temporary hardness of water may be removed by adding
23. The activated sludge process is sometime referred as
24. Sanitizers used for rubber made equipments are
25. Both temporary and permanent hardness of water can be removed on boiling water with

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