The intake opening is generally covered by a screen to prevent entry of debris e

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Question
The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept
Options
A. at the level of water of the source
B. at the bottom of water of the source
C. at about 2.5 m above the bottom
D. none of these.

Correct Answer

at about 2.5 m above the bottom

Water Supply Engineering problems

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1. Cast iron pipes
Options
A. are widely used in city water supplies
B. resist corrosion satisfactorily
C. may last for 100 years
D. are normally manufactured in lengths of about 3.5 m
E. all the above.

2. Pick up the correct statement from the following :
Options
A. The pH value of neutral water is 7
B. The maximum acidity is obtained when pH value is zero
C. The maximum alkalinity is obtained when pH value is 14.
D. All the above.

4. The duration of contact of chlorine with water before it is served to the first consumer, should be at least
Options
A. 10 to 15 minutes
B. 15 to 20 minutes
C. 20 to 30 minutes
D. 30 to 40 minutes
E. one hour.

6. Plain chlorination is used for water
Options
A. with turbidities less than 20 mg/litre
B. obtained from clear lakes
C. consumed during emergencies
D. supplies to armies during war
E. all the above.

10. Pick up the correct statement from the following :
Options
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.

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