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Waste Water Engineering

Waste Water Engineering
Disposal to sewage in large cities, is done in

Dilution
Purification
Oxidation
Irrigation

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

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

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Waste Water Engineering
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

160 cm
120 cm
140 cm
100 cm

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Waste Water Engineering
The following is the physical characteristic of sewage

All listed here
Turbidity
Colour
Odour

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

200 mg/l
400 mg/l
300 mg/l
100 mg/l

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Waste Water Engineering
For drainage pipes in buildings the test applied before putting them to use, is

Water test
All listed here
Straightness test
Smoke test

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