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Waste Water Engineering

Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Rivers
Seas
Lakes
None of these

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

Outfall sewer
House sewer
Branch sewer
Main sewer

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

16 to 24 hours
8 to 16 hours
4 to 8 hours
24 to 36 hours

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Waste Water Engineering
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

1.5 D
1.25 D
1.15 D
1.75 D

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Waste Water Engineering
The gas evolved in sewers is

Methane
Carbondioxide
All of these
Hydrogen sulphide

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Waste Water Engineering
In sewers designed with self cleansing velocity,

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

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