Civil Engineering - Water Supply Engineering

16. 

Velocity of flow of water in plain sedimentation water tank, is normally kept

A. 3 cm/minute
B. 10 cm/minute
C. 20 cm/minute
D. 30 cm/minute
E. 40 cm/minute.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

17. 

The most important and widely used tube well in India, is

A. strainer well
B. cavity well
C. slotted well
D. perforated pipe well.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

18. 

Pick up the correct statement from the following :

A. The precipitation during its travel in atmosphere dissolves certain gases
B. Rain water which percolates through the ground, is free from suspended materials
C. Under ground water may dissolve minerals and salts present in the earth's layers
D. Small quantities of iron, calcium and magnesium dissolved in water, may be useful for human health
E. All the above.

Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.

19. 

The maximum permissible chloride content in treated water of public water supplies should not exceed

A. 50 P.P.M.
B. 100 P.P.M.
C. 150 P.P.M.
D. 200 P.P.M.
E. 250 P.P.M.

Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.

20. 

To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36, 00, 000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 Q, the water horse power of the pump is

A. 400
B. 450
C. 500
D. 580
E. 600

Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.