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Waste Water Engineering

Waste Water Engineering
If the pH value of sewage is 7

It is acidic
It is alkaline
None of these
It is neutral

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Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43832
43833
43894
43834

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Waste Water Engineering
It is customary to design a sewer for D.W.F. on the basis of

Average demand
Twice the average demand
Four times the average demand
Thrice the average demand

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Waste Water Engineering
Ventilating shafts are provided to a sewer line at every

100 m
300 m
150 m
200 m

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Invert level of a branch sewer is more than 60 cm that of the main sewer
Ordinary manhole cannot be built
Sewer line runs along a main road
Two sewer lines intersect

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

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

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