# Civil Engineering - Waste Water Engineering

### Exercise :: Waste Water Engineering - Section 3

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.

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

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.

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

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.