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Waste Water Engineering

Waste Water Engineering
Setting out the alignments of sewers may start from

Any point
City
Out-fall
Tail end

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Waste Water Engineering
The use of coarse screens for the disposal of sewage, may be dispensed with by

Comminutor
Shredder
Both A and B
Neither A nor B

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

250 mg/l
150 mg/l
50 mg/l
100 mg/l

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Waste Water Engineering
The flow velocity in detritus tanks is

1.25 m/sec
0.05 m/sec
0.09 m/sec
None of these

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Waste Water Engineering
If the pH value of sewage is 7

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

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Waste Water Engineering
For design of sewers, percentage of sewage discharge is assumed

75 to 80%
65 to 70%
0.85
70 to 75%

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