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Waste Water Engineering

Waste Water Engineering
Flocculated particles do not change their

Weight
None of these
Shape
Size

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Waste Water Engineering
Sewer manholes are generally provided at

The junctions of sewers
The change of direction
All of these
The change of gradient

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Waste Water Engineering
It is customary to design a sewer for D.W.F. on the basis of

Four times the average demand
Twice the average demand
Thrice the average demand
Average demand

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Waste Water Engineering
Fresh sewage may become stale in

Three to four hours
Six hours
One hour
Two to three hours

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Waste Water Engineering
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

Oxygen
Methane
Hydrogen sulphide
Carbon dioxide

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Waste Water Engineering
pH value of sludge during alkaline regression stage, is

More than 7
Less than 6
More than 6
Less than 7

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