Civil Engineering - Waste Water Engineering

31. 

The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

A. 20 m
B. 30 m
C. 45 m
D. 75 m.

Answer: Option C

Explanation:

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32. 

The design period in years for pumping plants, is

A. 1
B. 2 to 3
C. 3 to 5
D. 5 to 10

Answer: Option D

Explanation:

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33. 

The Chezy's constant C in the formula V = C rs depends upon

A. size of the sewer
B. shape of the sewer
C. roughness of sewer surface
D. hydraulic characteristics of sewer
E. all the above.

Answer: Option E

Explanation:

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34. 

Afive day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

A. 100
B. 1000
C. 5000
D. 10000

Answer: Option D

Explanation:

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35. 

The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

A. 0.05552 cumec
B. 0.05554 cumec
C. 0.05556 cumec
D. 0.0556 cumec
E. 0.0558 cumec.

Answer: Option C

Explanation:

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