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Waste Water Engineering

Waste Water Engineering
The intensity of rain is expressed in

cm/minute
None of these
cm/hour
cm/day

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Waste Water Engineering
The use of coarse screens for the disposal of sewage, may be dispensed with by

Comminutor
Shredder
Neither A nor B
Both A and B

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Waste Water Engineering
An inverted siphon is designed generally for

Three pipes
One pipe
Four pipes
Two pipes

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Greater than 0.1 mm
Less than 0.1 mm
Less than 0.01 mm
Less than 0.05 mm

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Waste Water Engineering
The screens are fixed

Parallel to the direction of flow
None of these
At an angle 30° to 60° to the direction of flow
Perpendicular to the direction of flow

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Waste Water Engineering
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

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

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