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Waste Water Engineering

Waste Water Engineering
The minimum diameter of sewer to be adopted is

25 cm
10 cm
12.5 cm
15 cm

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Waste Water Engineering
During purification process of sewage the gas given off, is

Hydrogen
Carbon dioxide
Ammonia
All listed here

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Waste Water Engineering
Facultative bacteria survive in

Neither A nor B
Both cases A and B
The absence of oxygen
The presence of oxygen

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Waste Water Engineering
It is customary to design a sewer for D.W.F. on the basis of

Twice the average demand
Four times the average demand
Average demand
Thrice the average demand

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Low estimates of the average and maximum flows
Unexpected increase in population
Large scale infiltration of storm water
All listed here

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Waste Water Engineering
The grit and silt of the grit chambers, may not be used for

Neither A nor B
Both A and B
Raising low lying areas by dumping
Concreting

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