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Waste Water Engineering

Waste Water Engineering
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

None of these
200 ppm
225 ppm
250 ppm

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Waste Water Engineering
The average temperature of sewage in India, is

25°C
20°C
15°C
10°C

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Waste Water Engineering
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

Pneumatic ejector
Reciprocating pump
Centrifugal pump
None of these

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Waste Water Engineering
The screens are fixed

Parallel to the direction of flow
None of these
At an angle 30° to 60° to the direction of flow
Perpendicular to the direction of flow

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Waste Water Engineering
The drop man holes are generally provided in sewers for

Cities in plains
Large town ships
Industrial areas
Hilly town ships

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Waste Water Engineering
Fresh sewage may become stale in

Three to four hours
Six hours
One hour
Two to three hours

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