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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

None of these
1 in 100
1 in 60
1 in 120

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Waste Water Engineering
The algae dies out in the zone of

Active decomposition
Recovery
Cleaner water
Degradation

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Waste Water Engineering
An inverted siphon is designed generally for

Two pipes
Four pipes
One pipe
Three pipes

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Waste Water Engineering
A drop manhole is provided if

A branch sewer joins the main sewer at higher level
None of these
A sewer drops from a height
A lamp is inserted to check obstruction

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

5000
10000
100
1000

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

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