The most ideal disinfectant used for drinking water throughout the world, is alu

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Question
The most ideal disinfectant used for drinking water throughout the world, is
Options
A. alum
B. lime
C. chlorine
D. nitrogen
E. ammonia.

Correct Answer

chlorine

Water Supply Engineering problems

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2. 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.

3. 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).

6. 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.

7. 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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