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Waste Water Engineering

Waste Water Engineering
Chlorination of water is done for the removal of

Hardness
Sediments
Bacterias
Suspended solids

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

4 hours
8 hours
6 hours
2 hours

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Waste Water Engineering
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is

90 cm
80 cm
100 cm
50 cm

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Waste Water Engineering
When drainage to sewage ratio is 20, the peak dry weather flow is

20% of the design discharge
Slightly less than 5% of the design discharge
None of these
Slightly more than 5% of the design discharge

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Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

Phenol-di -sulphuric acid potassium hydroxide
Potassium permanganate
None of these
Sulphuric acid and napthamine

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Waste Water Engineering
The most widely used pump for lifting sewage is

Reciprocating pump
Air pressure pump
Pneumatic ejector
Centrifugal pump

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