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Waste Water Engineering

Waste Water Engineering
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

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

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Waste Water Engineering
Sewer manholes are generally provided at

All of these
The change of gradient
The change of direction
The junctions of sewers

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Waste Water Engineering
The sewer which transports the sewage to the point of treatment, is called

Main sewer
House sewer
Branch sewer
Out-fall sewer

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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

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

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Waste Water Engineering
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is

20 mm
50 mm
30 mm
40 mm

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Waste Water Engineering
Clogging of sewers, is caused due to

Low discharge
All of these
Greasy and oily matters
Silting

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