Civil Engineering - Water Supply Engineering

26. 

In an artesian acquifer, the draw downs in two observation wells at distances 100 m, and 200 m were found same after one hour and x hours respectively. The value of x, is

A. 2 hours
B. 4 hours
C. 9 hours
D. 16 hours.

Answer: Option B

Explanation:

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27. 

Dissolved carbon dioxide, can be removed from the supply main by

A. sedimentation
B. aeration
C. chlorination
D. coagulation
E. none of these.

Answer: Option B

Explanation:

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28. 

Slow sand filter is used if maximum turbidity of raw water is less than

A. 10 gm/litre
B. 20 gm/litre
C. 30 gm/litre
D. 40 gm/litre
E. 50 gm/litre.

Answer: Option E

Explanation:

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29. 

The external load per unit length of

A. a pipe laid on, or projecting above the undisturbed ground and covered with fills, is proportional to the square of the external diameter of the pipe
B. a flexible pipe burried in narrow trenches and thoroughly compacted side fills, is proportional to the product of the width of the trench and diameter of the pipe
C. a rigid pipe burried in a narrow trenches and thoroughly compacted side fills, is proportional to the square of the width of the trench
D. all the above.

Answer: Option D

Explanation:

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30. 

The total domestic consumption in a city water supply, is assumed

A. 20%
B. 30%
C. 40%
D. 60%.

Answer: Option D

Explanation:

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