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Waste Water Engineering

Waste Water Engineering
Imhoff cone is used to measure

Settleable solids
Total solids
Total organic solids
Total in organic solids

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

100
10000
1000
5000

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Waste Water Engineering
Aerobic activity is maximum

At sewer pipes
In freshly produced sewage
None of these
In sewer treatment plants

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Waste Water Engineering
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

None of these
A heap
Plateau
Windrow

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Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/2
D/3
D/1
D/4

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Waste Water Engineering
The rate of accumulation of sludge per person per year, is

20 litres
25 litres
15 litres
10 litres

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