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Waste Water Engineering

Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

3
1.5
2
4

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Waste Water Engineering
Facultative bacteria survive in

Neither A nor B
Both cases A and B
The presence of oxygen
The absence of oxygen

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Waste Water Engineering
The porosity of sediments in sewer pipes, is usually taken as

0.013
0.011
0.012
0.01

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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
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Hydrogen sulphide
Carbon dioxide
Oxygen
Methane

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Waste Water Engineering
In sewers designed with self cleansing velocity,

Neither silting nor scouring occurs at the bottom
Both silting and scouring occur at the bottom
The bottom is silted
The bottom is scoured

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