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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
1 in 60
None of these

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Waste Water Engineering
A rainfall may be classified as acidic if its pH value is less or equal to

6.5
7
6
5

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Waste Water Engineering
The most dangerous pollutant in vehicular emissions is

SO₂
O₂
CO₂
CO₂

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Waste Water Engineering
Self-cleansing velocity is

Velocity at which no accumulation remains in the drains
Velocity of water in a pressure filter
Velocity at dry weather flow
Velocity of water at flushing

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Waste Water Engineering
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

5.5 m
5 m
6.5 m
7 m

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Waste Water Engineering
‘Cowl’ is provided at

First step in manhole
Lower end of ventilating column
Upper end of ventilating column
Upper end of the manhole

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