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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

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

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

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Waste Water Engineering
The settlement of a particle in sedimentation tank, is affected by

All listed here
Velocity of flow
Viscosity of water
Size and shape of solid

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Waste Water Engineering
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

20 cm
50 cm
25 cm
40 cm

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Waste Water Engineering
Dry weather flow is:

Average annual rate of flow
Average daily rate of flow
Average monthly rate of flow
Water supply allowance per capita

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Waste Water Engineering
An inverted siphon is designed generally for

Three pipes
One pipe
Two pipes
Four pipes

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