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WASTE WATER ENGINEERING

Waste Water Engineering
Sewer manholes are generally provided at

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

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Waste Water Engineering
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

First stage demand
All of these
Initial demand
Carbonaceous demand

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Waste Water Engineering
The asbestos cement pipes are generally laid

Horizontally
At an angle of 30°
Vertically
At an angle of 60°

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

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

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Waste Water Engineering
The small sewers are cleaned by

Flushing
None of these
Wooden pills
Cane rodding

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