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Waste Water Engineering

Waste Water Engineering
The drop man holes are generally provided in sewers for

Industrial areas
Large town ships
Cities in plains
Hilly town ships

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

20 litres
25 litres
10 litres
15 litres

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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
100 mg/l
300 mg/l

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

All of these
Unexpected increase in the population
Under estimates of maximum and average flows
Unexpected large scale infiltration of stream water

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Waste Water Engineering
For house drainage minimum gradient is

1 in 80
1 in 60
1 in 10
1 in 400

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Waste Water Engineering
At the junction of sewers

Tops of both the sewers are at the same level
None of these
Top of larger sewer is kept lower
Top of smaller sewer is kept lower

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