Water Supply Engineering problems
- 1. The maximum permitted loss of head in a rapid sand filter, is
Options- A. 1 m
- B. 2 m
- C. 3 m
- D. 4 m
- E. 5 m. Discuss
Correct Answer: 3 m
- 2. The permissible pH value for public water supplies may range between
Options- A. 4.5 to 5.5
- B. 5.5 to 6.5
- C. 6.5 to 8.5
- D. 8.5 to 10.5
- E. none of these. Discuss
Correct Answer: 6.5 to 8.5
- 3. Standard process of chlorination of water, is done by
Options- A. plain chlorination
- B. pre-chlorination
- C. post-chlorination
- D. double chlorination. Discuss
Correct Answer: post-chlorination
- 4. For maximum alkalinity of water, pH value should be
Options- A. zero
- B. less than 7
- C. more than 7
- D. 14
- E. 21 Discuss
Correct Answer: 14
- 5. The strainer type tube well, is unsuitable for
Options- A. coarse gravels
- B. fine sandy strata
- C. clean gravels
- D. none of these. Discuss
Correct Answer: fine sandy strata
- 6. The four major water supply distribution systems, are
Options- A. dead end, tree, grid iron and reticulation
- B. dead end, tree, grid iron and circular
- C. tree, grid iron, ring and radial
- D. tree, reticulation, circular and ring. Discuss
Correct Answer: tree, grid iron, ring and radial
- 7. Critical time for developing a water hammer, is the time required for
Options- A. closing the valve
- B. the wave to travel from valve to the reservoir
- C. the wave to travel from the valve to the reservoir and back
- D. none of these. Discuss
Correct Answer: the wave to travel from the valve to the reservoir and back
- 8. Maximum threshold number permitted for indicating the odour of public water supplies, is
Options- A. 1
- B. 2
- C. 3
- D. 4
- E. 5 Discuss
Correct Answer: 3
- 9. In the equation
of a logistic curve of population growth, the constant m is
Options- A. Ps x P
- B.
- C.
- D. KPs . Discuss
Correct Answer:
- 10. The most commonly used chemical for dechlorination of water, is
Options- A. sodium thiosulphate
- B. sodium bisulphate
- C. sodium sulphite
- D. sulphur-dioxide
- E. all the above. Discuss
Correct Answer: sodium sulphite
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