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Waste Water Engineering

Waste Water Engineering
The self-cleansing velocity of water flowing through pipe lines, is

1 metre/sec
2 metres/sec
0.25 metre/sec
0.5 metre/sec

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Waste Water Engineering
Which one of the following tests is used for testing sewer pipes?

Ball test
Water test
Mirror test
All of these

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Waste Water Engineering
The most widely used pump for lifting sewage is

Reciprocating pump
Centrifugal pump
Pneumatic ejector
Air pressure pump

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

4
1.5
3
2

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Waste Water Engineering
The pH value of fresh sewage is usually

Equal to zero
Less than 7
More than 7
Equal to 7

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

10% less
20% less
20% more
10% more

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