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Waste Water Engineering

Waste Water Engineering
15 cumecs, the depth d and width are related by For drains up to

d = 0.2 B
B = 0.5 d
d = 0.5 B
B = 0.2 d

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

Neither A nor B
Shredder
Both A and B
Comminutor

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Waste Water Engineering
For detecting the nitrates in sewage, the colour may be developed by adding

Sulphuric acid and napthamine
Potassium permanganate
None of these
Phenol-di -sulphuric acid and potassium hydroxide

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Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

15°C
20°C
0°C
25°C

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Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Methane
Carbon dioxide
Oxygen
Hydrogen sulphide

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Waste Water Engineering
In sewage, the solids in mg per litre is

1500 to 2000
500 to 1000
100 to 500
1000 to 1500

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