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

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

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Waste Water Engineering
The clarigesters are

Rectangular septic tanks
Circular septic tanks
Circular Imhoff double storey tanks without bottom hoppers
Circular Imhoff double tanks with bottom hoppers

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Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
The men entering the manhole should be advised to smoke in the sewer
Warning signals should be erected
Proper tests for the presence of poisonous gases must be carried out

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