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Waste Water Engineering

Waste Water Engineering
For drainage pipes in buildings the test applied before putting them to use, is

Straightness test
Water test
Smoke test
All listed here

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Waste Water Engineering
When drainage to sewage ratio is 20, the peak dry weather flow is

None of these
Slightly less than 5% of the design discharge
20% of the design discharge
Slightly more than 5% of the design discharge

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

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

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

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

All listed here
Sedimentation
Screening
Oxidation

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Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

14 days
2 days
7 days
12 days

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