Civil Engineering - Water Supply Engineering

31. 

The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept

A. at the level of water of the source
B. at the bottom of water of the source
C. at about 2.5 m above the bottom
D. none of these.

Answer: Option C

Explanation:

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32. 

In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than

A. 10
B. 15
C. 20
D. 25

Answer: Option C

Explanation:

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33. 

The maximum permissible hardness for public supplies is

A. 95 mg/litre
B. 105 mg/litre
C. 115 mg/litre
D. 125 mg/litre
E. 150 mg/litre.

Answer: Option C

Explanation:

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34. 

Plain chlorination is used for water

A. with turbidities less than 20 mg/litre
B. obtained from clear lakes
C. consumed during emergencies
D. supplies to armies during war
E. all the above.

Answer: Option E

Explanation:

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35. 

Underground water is obtained from

A. rains
B. rivers
C. lakes
D. reservoirs
E. springs.

Answer: Option E

Explanation:

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