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Waste Water Engineering

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

Oxidation
Dilution
Purification
Irrigation

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Waste Water Engineering
In sewers the gas generally found, is

All listed here
Carbon dioxide (CO2)
Methane (CH4)
Hydrogen sulphide (H2S)

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

15
10
5
20

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Waste Water Engineering
Sewer ventilating columns are generally placed at

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

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Waste Water Engineering
The screens are fixed

None of these
At an angle 30° to 60° to the direction of flow
Parallel to the direction of flow
Perpendicular to the direction of flow

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Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Oxygen
Carbon dioxide
Hydrogen sulphide
Methane

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