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Environmental Engineering

Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

15 to 30 cm/minute
15 to 30 cm/sec
5 to 10 cm/sec
15 to 30 cm/hour

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Environmental Engineering
Which of the following sewers is preferred for combined system of sewage?

Rectangular sewer
Egg shaped sewer
None of these
Circular sewer

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Environmental Engineering
The percentage of chlorine in fresh bleaching powder is about

20 to 25
10 to 15
30 to 35
40 to 50

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Environmental Engineering
The gas from sludge digestion tank is mainly composed of

Hydrogen sulphide
Carbon dioxide
Nitrogen
Methane

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Environmental Engineering
In chlorination, with the rise in temperature of water, death rate of bacteria

Decreases
None of these
Increases
Remains unaffected

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Environmental Engineering
The velocity of flow does not depend on

Grade of sewer
Length of sewer
Hydraulic mean depth of sewer
Roughness of sewer

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