# Civil Engineering - Water Supply Engineering

### Exercise :: Water Supply Engineering - Section 2

26.

During treatment of water, sedimentation is done

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

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

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).

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.

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.