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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
10
15
5

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Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

1 hour
2 hours
30 minutes
1 hour and 30 minutes

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Waste Water Engineering
pH value of sludge during alkaline regression stage, is

More than 6
More than 7
Less than 7
Less than 6

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Dissolved oxygen in water
Hydrology
All listed here
Temperature

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Waste Water Engineering
Sewer ventilating columns are generally placed at

Distances 150 m to 300 m
Every change in the size of sewers
Upper ends of branch sewers
All listed here

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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
Carbon dioxide
Methane

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