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Waste Water Engineering

Waste Water Engineering
The recommended detention period for grit chambers is

5 minutes
2 minutes
3 minutes
1 minute

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Waste Water Engineering
In sewers the velocity of flow should not be

Less than 10 m/sec
More than 20 m/sec
Less than the self-cleansing velocity
More than the self-cleansing velocity

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Waste Water Engineering
The ratio of design discharge to the surface area of a sedimentation tank is called

All of these
Overflow velocity
Overflow rate
Surface loading

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Waste Water Engineering
Setting out the alignments of sewers may start from

City
Tail end
Out-fall
Any point

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Waste Water Engineering
A manhole is generally provided at each

Bend
All of these
Change of gradient
Junction

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Waste Water Engineering
The gas evolved in sewers is

All of these
Methane
Carbondioxide
Hydrogen sulphide

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