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Waste Water Engineering

Waste Water Engineering
The water carried sewerage system removes

Industrial sewage
Storm sewage
Domestic sewage
All listed here

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

200 mg/l
400 mg/l
300 mg/l
100 mg/l

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Waste Water Engineering
Are available in size Stoneware sewers

15 cm
10 cm
All of these
20 cm

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Waste Water Engineering
Large diameter sewers subjected to external pressure alone, are reinforced

Both A and B
With elliptical cage
Near the outer surface of the pipe
Near the inner surface of the pipe

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Waste Water Engineering
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

0.75 m/sec
0.50 m/sec
0.70 m/sec
0.60 m/sec

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

2.5
1.5
3
2

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