Civil Engineering - Water Supply Engineering

11. 

Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m2 , generally range between

A. 250 to 500
B. 500 to 750
C. 750 to 1000
D. 1000 to 1250

Answer: Option D

Explanation:

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12. 

In a rapid sand filter, air binding is caused due to excessive

A. negative pressure
B. pressure
C. turbidity
D. water pressure
E. all the above.

Answer: Option A

Explanation:

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13. 

If average volume of sediment deposits is one-tenth million cubic metres per year in a reservoir of total capacity 10 million cubic metres, the dead storage will be filled up, in

A. 10 years
B. 15 years
C. 20 years
D. 25 years
E. 50 years.

Answer: Option D

Explanation:

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14. 

A circular gravity aqueduct is not generally preferred to because of

A. its maximum hydraulic mean depth
B. maximum area per unit of wetted perimeter
C. minimum cost of construction
D. its proper support on the ground.

Answer: Option D

Explanation:

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15. 

Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided

A. silica
B. mud
C. clay
D. organic matter.

Answer: Option A

Explanation:

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