The chloride content of treated water for public supplies should not exceed 100

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Question
The chloride content of treated water for public supplies should not exceed
Options
A. 100 ppm
B. 150 ppm
C. 200 ppm
D. 250 ppm
E. 300 ppm.

Correct Answer

250 ppm

Water Supply Engineering problems

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2. Rapid gravity filters
Options
A. were developed by G.W. Fullar
B. make use of coarser sand with effective size as 0.5 mm
C. yield as high as 30 times the yield of slow sand filters
D. are fed with coagulation treated water
E. all the above.

3. A centrifugal pump is required to be primed before starting if it is located
Options
A. at higher level than water level of reservoir
B. at lower level than water level of reservoir
C. both (a) and (b)
D. neither (a) nor (b).

6. 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.

9. 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).

10. 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.

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