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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 60
None of these
1 in 100
1 in 120

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Waste Water Engineering
Clogging of sewers, is caused due to

All of these
Greasy and oily matters
Low discharge
Silting

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Waste Water Engineering
House connections to the laterals is generally made by

P.C.C.
Glazed stonewares
R.C.C.
Cast iron

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05554 cumec
0.05552 cumec
0.05556 cumec
0.0556 cumec

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Waste Water Engineering
The most widely used pump for lifting sewage is

Pneumatic ejector
Air pressure pump
Centrifugal pump
Reciprocating pump

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Waste Water Engineering
Rate of flow of sewage is generally assumed

Equal to the rate of water supply
More than the rate of water supply
At 150 litres per capita
Less than the rate of water supply

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