Civil Engineering - Water Supply Engineering

26. 

During treatment of water, sedimentation is done

A. before filtration
B. after filtration
C. simultaneously with filtration
D. along with chlorination.

Answer: Option A

Explanation:

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27. 

E. Coli bacterias die in water having pH greater than

A. 5.5
B. 6.5
C. 7.5
D. 8.5
E. 9.5

Answer: Option E

Explanation:

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28. 

Check valves are installed

A. on the delivery side of the pumping set
B. at the interconnections between polluted water system and a potable water system
C. both (a) and (b)
D. neither (a) nor (b).

Answer: Option C

Explanation:

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29. 

The equation in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference of R.L.s. of lowest and highest points and A is area of catchment in square metres, is known as

A. English formula
B. Khosla's formula
C. Justin's formula
D. Vermule's formula.

Answer: Option C

Explanation:

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30. 

If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in square kilometres is A, the total run-off Q, is given by

A. Q = 1.758 x 102 x API
B. Q = 2.758 x 102 x API
C. Q = 2.758 x 103 x API
D.
E.

Answer: Option C

Explanation:

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