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Waste Water Engineering

Waste Water Engineering
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

2 hours
4 hours
3 hours
5 hours

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

Alkaline fermentation
None of these
Acid regression
Acid fermentation

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Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Circular
Horse shoe shaped
Rectangular
Egg shaped

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

8 hours
6 hours
2 hours
4 hours

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Ordinary manhole cannot be built
Two sewer lines intersect
Invert level of a branch sewer is more than 60 cm that of the main sewer
Sewer line runs along a main road

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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

200 ppm
None of these
250 ppm
225 ppm

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