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Waste Water Engineering

Waste Water Engineering
Water content of sewage is about

0.9
0.99
0.95
0.999

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.20 cumec
0.12 cumec
0.10 cumec
0.15 cumec

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Waste Water Engineering
In trickling filter, B.O.D. is reduced to

80 to 90%
60 to 80%
30 to 40%
40 to 60%

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Waste Water Engineering
The intensity of rain is expressed in

cm/minute
None of these
cm/hour
cm/day

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Waste Water Engineering
A nuisance is experienced in diluting water if dilution factor is less than

20
100
40
60

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Waste Water Engineering
Which one of the following tests is used for testing sewer pipes?

Mirror test
Ball test
Water test
All of these

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