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Water Supply Engineering problems

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1. Pick up the correct statement from the following :
Options
A. Detention period for plain sedimentation tanks ranges between 4 to 8 hours
B. Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours
C. The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute
D. All the above.

2. Economic height of a dam is the height corresponding to which
Options
A. cost of the dam per unit of storage is minimum
B. amount of silting is less
C. cost of dam per unit storage is maximum
D. free board provided is least
E. none of these.

3. Pick up the incorrect statement from the following regarding fire hydrants
Options
A. Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
B. The minimum water pressure hydrants, is kept 1.5 kg/cm²
C. The water at pressure 1 to 1.5 kg/cm² is made available for 4 to 5 hours for constant use
D. None of these.

6. Time of concentration
Options
A. is the time taken, for precipitation
B. duration of rainfall.
C. time taken for all the ran off to reach the drain
D. time taken for the storm water to travel from the most remote point to the drain.

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