A. reducing the draw down and the pumping rate
B. reducing the flow velocity
C. using thicker pipes
D. using screens having larger area of openings
E. none of these
Related Mcqs:
- The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level_______________?
A. 1500 m
B. 1505 m
C. 1475 m
D. 1485 m - In distribution pipes, drain valves are provided at_______________?
A. lower point
B. higher point
C. junction points
D. any where - Asbestos pipes are ______________?
A. light in weight and easy to transport
B. highly resistant to corrosion
C. high flexible to accommodate deflection upto 12°
D. very much smooth and hydraulically efficient
E. all the above - The fire demand of a city may be worked out by _________________?
A. Kuichling’s formula
B. Freeman formula
C. Under Writers formula
D. Bustan’s formula
E. All the above. - Disinfection of drinking water, is done to remove_________________?
A. odour
B. bacterias
C. turbidity
D. colour - For determining the velocity of flow of underground water, the most commonly used non-empirical formula is________________?
A. Darcy’s formula
B. Slichter’s formula
C. Hazen’s formula
D. Lacy’s formula - The maximum depth of sedimentation tanks is limited to________________?
A. 2 m
B. 3 m
C. 4 m
D. 5 m
E. 6 m - Surge tanks are used_______________?
A. for storage water
B. to increase the velocity in a pipeline
C. as overflow valves
D. to guard against water hammer - Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
A. nil
B. 5
C. 10
D. 15
E. 20 - Aeration of water is done to remove______________?
A. odour
B. colour
C. bacterias
D. hardness
E. turbidity
