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Waste Water Engineering

Waste Water Engineering
Facultative bacteria survive in

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

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Waste Water Engineering
Imhoff cone is used to measure

Total in organic solids
Total solids
Settleable solids
Total organic solids

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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
5 hours
3 hours

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.022d + 0.085H)/Q
d (0.285d + 0.011H)/Q
d (0.785d + 0.011H)/Q
d² (0.011d + 0.785H)/Q

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Waste Water Engineering
The spacing of bars of perforations of fine screens used for the treatment of sewage, is

2 to 3 mm
5 to 8 mm
3 to 5 mm
8 to 10 mm

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Waste Water Engineering
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

Petrol vapours
Carbondioxide gas
Hydrogen sulphide gas
Methane gas

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