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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

1 in 100
1 in 120
None of these
1 in 60

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

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

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Waste Water Engineering
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 + P1)/(100 – P2)] V1
[(100 + P2)/(100 – P1)] V1
[(100 – P1)/(100 + P2)] V1
[(100 – P1)/(100 – P2)] V1

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Waste Water Engineering
Flocculated particles do not change their

None of these
Size
Shape
Weight

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Waste Water Engineering
The average temperature of sewage in India, is

15°C
20°C
25°C
10°C

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

Tail end
Any point
City
Out-fall

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