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Waste Water Engineering

Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

Nitrates
None of these
Nitrites
Free ammonia

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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

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

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Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Lakes
Seas
Rivers
None of these

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Waste Water Engineering
The minimum recommended diameter of sewers, is

10 cm
5 cm
15 cm
20 cm

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Waste Water Engineering
Which one of the following tests is used for testing sewer pipes?

All of these
Water test
Mirror test
Ball test

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Waste Water Engineering
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

Methane
Carbon dioxide
Hydrogen sulphide
Oxygen

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