Civil Engineering - Water Supply Engineering

11. 

Most commonly used pump for lifting water in water supply mains, is

A. axialflow pump
B. reciprocating pump
C. rotary type pump
D. centrifugal pumps
E. none of these.

Answer: Option A

Explanation:

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12. 

Economic height of a dam is the height corresponding to which

A. cost of the dam per unit of storage is minimum
B. amount of silting is less
C. cost of dam per unit storage is maximum
D. free board provided is least
E. none of these.

Answer: Option A

Explanation:

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13. 

Distribution mains of any water supply, is normally designed for its average daily requirement

A. 100%
B. 150%
C. 200%
D. 225%.

Answer: Option D

Explanation:

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14. 

If pH value of water is

A. 7 water it is said to be neutral
B. less than 7 it is said to be acidic
C. more than 7 it is said to be alkaline
D. all the above.

Answer: Option D

Explanation:

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15. 

In pressure supply mains, water hammer pressure is reduced by providing

A. sluice valves
B. air valves
C. pressure relief valves
D. none of the these.

Answer: Option C

Explanation:

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