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Waste Water Engineering

Waste Water Engineering
The factor responsible for purification of sewage in river is

Temperature
Dissolved oxygen in water
Hydrology
All listed here

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Waste Water Engineering
Maximum permissible velocity 1.5 m/sec, is adopted in drains

Lined with stones
With beds of rocks and gravels
Neither A. nor B.
Both A. and B.

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Unexpected increase in population
All listed here
Low estimates of the average and maximum flows
Large scale infiltration of storm water

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Waste Water Engineering
The sewer which resists sulphide corrosion, is

Brick sewer
R.C. sewer
Cast iron sewer
Lead sewer

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Waste Water Engineering
The screens are fixed

At an angle 30° to 60° to the direction of flow
Parallel to the direction of flow
Perpendicular to the direction of flow
None of these

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Waste Water Engineering
For large sewers, maximum distance between manholes may be

300 m
200 m
100 m
50 m

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