Civil Engineering - Water Supply Engineering

6. 

Air inlet valve in water mains, is generally provided at

A. summit of the pipe
B. upstream of sluice valve
C. down stream of sluice valve
D. valley of the pipe
E. both (a) and (c) of above.

Answer: Option E

Explanation:

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7. 

The duration of contact of chlorine with water before it is served to the first consumer, should be at least

A. 10 to 15 minutes
B. 15 to 20 minutes
C. 20 to 30 minutes
D. 30 to 40 minutes
E. one hour.

Answer: Option C

Explanation:

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8. 

The diameter of pipes in bath rooms and lavatories in domestic water supply, is

A. 6 mm
B. 12 mm
C. 18 mm
D. 24 mm.

Answer: Option B

Explanation:

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9. 

Pick up the incorrect statement from the following :

A. The water entering the slow sand filters should be treated by 9.386 coagulants
B. The depth of water on the filter should be twice the depth of the filter sand
C. When the filter head is 0.75 times the depth of filter sand, the water obtained is purest
D. The cleaning of slow sand filters is done by back washing
E. All the above.

Answer: Option E

Explanation:

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10. 

m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by

A. velocity area method
B. weir or spillway method
C. use of venturi-meter
D. using power plant consumption
E. none of these.

Answer: Option A

Explanation:

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