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Waste Water Engineering

Waste Water Engineering
For sewers, inverted siphon is provided for

Four pipes
One pipe
Two pipes
Three pipes

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

Ferric sulphate
Chlorinated coppers
Ferric chloride
Alum

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Waste Water Engineering
15 cumecs, the depth d and width are related by For drains up to

d = 0.5 B
d = 0.2 B
B = 0.5 d
B = 0.2 d

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Waste Water Engineering
To maintain aerobic biological activity, the moisture content of the compost mass should be about

0.5
0.55
0.45
0.6

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Waste Water Engineering
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

Petrol vapours
Hydrogen sulphide gas
Carbondioxide gas
Methane gas

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Waste Water Engineering
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

First stage demand
All of these
Carbonaceous demand
Initial demand

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