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Waste Water Engineering

Waste Water Engineering
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is

20
15
5
10

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Waste Water Engineering
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

Hydrogen sulphide
Oxygen
Methane
Carbon dioxide

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Waste Water Engineering
The sewerage system originates from

Main sewers
Branch sewers
House sewers
Lateral sewers

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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

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

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

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Waste Water Engineering
For sewers, inverted siphon is provided for

One pipe
Three pipes
Two pipes
Four pipes

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