Civil Engineering - Water Supply Engineering

26. 

Pick up the correct statement from the following :

A. The ratio of the total sediment deposited in the reservoir to the total sediment flowing in the river, is called trap efficiency
B. The ratio of the reservoir capacity to the total inflow of water in it, is generally called capacity inflow ratio
C. Small capacity reservoirs on large rivers generally, silt less
D. Large capacity reservoirs on small rivers generally silt more
E. All the above.

Answer: Option E

Explanation:

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27. 

Pressure relief valves are provided in water mains

A. to reduce the pressure
B. at low points
C. upstream of sluice
D. all the above.

Answer: Option D

Explanation:

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28. 

Pick up the incorrect statement from the following :

A. Iron salts produce heavy flocs and hence remove more suspended matter
B. Iron salts remove hydrogen sulphides
C. Iron salts can be used over a limited range of pH values
D. Iron salts impart corrosiveness to water.

Answer: Option C

Explanation:

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29. 

The percentage of chlorine in fresh bleaching powder is roughly

A. 50 to 60
B. 30 to 35
C. 40 to 50
D. 20 to 25

Answer: Option B

Explanation:

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30. 

Higher yield may be expected from

A. gravity springs
B. surface springs
C. artesian springs
D. all the above.

Answer: Option C

Explanation:

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