Water is supplied from the source to the treatment plant under gravity in Calcut

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Question
Water is supplied from the source to the treatment plant under gravity in
Options
A. Calcutta
B. Delhi
C. Madras
D. Bombay.

Correct Answer

Bombay.

Water Supply Engineering problems

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1. Derivation of Thiem's formula
is based on the assumption
Options
A. the aquifer is homogeneous, isotropic and of infinite depth and area
B. the well is sunk through the full depth of the aquifer
C. the flow lines are radial and horizontal, and the flow is laminar
D. for hydraulic gradient in Darcy's equation, tangent value is used for sine value
E. all the above.

2. In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,
Options
A. the reservoir will theoretically be silted in 240 years
B. the reservoir will start reducing after 60 years
C. both (a) and (b)
D. neither (a) nor (b).

5. The external load per unit length of
Options
A. a pipe laid on, or projecting above the undisturbed ground and covered with fills, is proportional to the square of the external diameter of the pipe
B. a flexible pipe burried in narrow trenches and thoroughly compacted side fills, is proportional to the product of the width of the trench and diameter of the pipe
C. a rigid pipe burried in a narrow trenches and thoroughly compacted side fills, is proportional to the square of the width of the trench
D. all the above.

7. Pick up the correct statement from the following :
Options
A. Head loss in smaller size pipes at equal velocities, is less
B. Cost of pumping is less in smaller size pipes
C. Cost of smaller pipes is comparatively more
D. None of these.

8. Pick up the incorrect statement from the following. In take of water supply should
Options
A. be nearer to the treatment plant
B. receive water from purer zone of the source
C. be located downstream of waste water disposal point
D. remain easily accessible during floods.

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