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Waste Water Engineering

Waste Water Engineering
Clogging of sewers, is caused due to

Low discharge
All of these
Silting
Greasy and oily matters

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Waste Water Engineering
Fresh sewage may become stale in

One hour
Two to three hours
Six hours
Three to four hours

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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

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

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Waste Water Engineering
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1.085
1.075
1.095
1.065

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Waste Water Engineering
R.M.O. expenses include

Operation expenses
All of these
Running expenses
Maintenance expenses

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Waste Water Engineering
Disposal to sewage in large cities, is done in

Irrigation
Dilution
Oxidation
Purification

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