In slow sland filters, the turbidity of raw water can be removed only up to 60 m

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Question
In slow sland filters, the turbidity of raw water can be removed only up to
Options
A. 60 mg/litre
B. 75 mg/litre
C. 100 gm/litre
D. 150 mg/litre.

Correct Answer

60 mg/litre

Water Supply Engineering problems

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2. 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.

4. 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.

5. 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.

9. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is
Options
A. 1880 kilo litres
B. 2880 kilo litres
C. 3880 kilo litres
D. 4880 kilo litres.

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