Civil Engineering - Water Supply Engineering

41. 

Disinfection of drinking water, is done to remove

A. odour
B. bacterias
C. turbidity
D. colour.

Answer: Option B

Explanation:

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42. 

Sunlight

A. helps growth of bacterias
B. impedes growth of algae
C. increases dissolved oxygen content
D. reduces turbidity.

Answer: Option B

Explanation:

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43. 

The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is

A. 2 m
B. 2.25 m
C. 2.50 m
D. 2.75 m
E. 3.00 m.

Answer: Option E

Explanation:

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44. 

Average annual rainfall at any station is the average of annual rainfall over a period of

A. 7 years
B. 14 years
C. 21 years
D. 28 years
E. 35 years.

Answer: Option E

Explanation:

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45. 

Time of concentration

A. is the time taken, for precipitation
B. duration of rainfall.
C. time taken for all the ran off to reach the drain
D. time taken for the storm water to travel from the most remote point to the drain.

Answer: Option D

Explanation:

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