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Waste Water Engineering

Waste Water Engineering
A rainfall may be classified as acidic if its pH value is less or equal to

6.5
5
7
6

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Waste Water Engineering
The flow velocity in detritus tanks is

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

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Waste Water Engineering
Imhoff cone is used to measure

Total in organic solids
Total solids
Settleable solids
Total organic solids

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Waste Water Engineering
House connections to the laterals is generally made by

Glazed stonewares
R.C.C.
P.C.C.
Cast iron

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

150 ppm
200 ppm
100 ppm
50 ppm

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Waste Water Engineering
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.25
2.55
2.5
2.65

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