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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
The effluent of a septic tank is

As good as that from a complete treatment
Foul and contains dissolved and suspended solids
None of these
Fit for discharge into any open drain

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Waste Water Engineering
The most dangerous pollutant in vehicular emissions is

SO₂
CO₂
O₂
CO₂

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Waste Water Engineering
The standard B.O.D. of water is taken for

2 days
3 days
1 day
5 days

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Waste Water Engineering
Rate of flow of sewage is generally assumed

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

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

Alkaline fermentation
Acid regression
Acid fermentation
None of these

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