Civil Engineering - Water Supply Engineering

11. 

Mud balls may be removed by

A. breaking and washing
B. washing the filter with a solution of caustic soda
C. removing, cleaning and replacing the damaged sand
D. all the above.

Answer: Option D

Explanation:

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12. 

For maximum alkalinity of water, pH value should be

A. zero
B. less than 7
C. more than 7
D. 14
E. 21

Answer: Option D

Explanation:

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13. 

The fire demand for a city of 50, 000 population, according to Godrich formula, is

A. 40 mld
B. 42 mld
C. 44 mld
D. 48 mld.

Answer: Option C

Explanation:

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14. 

The efficiency of sedimentation tank does not depend upon

A. depth of tank
B. length of tank
C. detention period
D. velocity of water.

Answer: Option A

Explanation:

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15. 

When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied

A. by pumping system
B. by gravitational system
C. both (a) and (b)
D. all the above.

Answer: Option B

Explanation:

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