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Waste Water Engineering

Waste Water Engineering
The pH value of fresh sewage is usually

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

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Waste Water Engineering
The rate of accumulation of sludge per person per year, is

20 litres
15 litres
25 litres
10 litres

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

2
3
4
1.5

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

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

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Waste Water Engineering
The sewer that unloads the sewage at the point of treatment is called

Outfall sewer
Branch sewer
Main sewer
House sewer

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

Flow velocity 0.15 m to 0.3 m/sec is kept
One minute of detention period is kept
Depth of 0.9 m to 1.20 m is kept
All of these

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