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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 60
1 in 100
None of these
1 in 120

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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
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Chezy
Bazin
Kutter
Manning

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

None of these
Acid fermentation
Acid regression
Alkaline fermentation

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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
For trunk and out-fall, the type of sewers generally used, is

Horse shoe shaped
Parabolic shaped
Circular shaped
Standard egg shaped

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