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Waste Water Engineering

Waste Water Engineering
An inverted siphon is designed generally for

Three pipes
Two pipes
Four pipes
One pipe

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Waste Water Engineering
For design of sewers, percentage of sewage discharge is assumed

70 to 75%
0.85
65 to 70%
75 to 80%

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Two sewer lines intersect
Invert level of a branch sewer is more than 60 cm that of the main sewer
Ordinary manhole cannot be built
Sewer line runs along a main road

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Waste Water Engineering
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

Hydraulically
Mechanically
Electrically
Manually

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Waste Water Engineering
The coagulant which is generally not used for treating the sewage, is

Chlorinated coppers
Alum
Ferric sulphate
Ferric chloride

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Waste Water Engineering
The most dangerous pollutant in vehicular emissions is

O₂
CO₂
SO₂
CO₂

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