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Waste Water Engineering

Waste Water Engineering
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

Methane
Carbon dioxide
Hydrogen sulphide
Oxygen

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Waste Water Engineering
The maximum depth of sedimentation tanks, is kept

4 m
4.5 m
3 m
3.5 m

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.94 D
D’ = 0.74 D
D’ = 0.84 D
D’ = 0.64 D

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Waste Water Engineering
The screens are fixed

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

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Waste Water Engineering
Setting out the alignments of sewers may start from

Any point
Tail end
Out-fall
City

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Waste Water Engineering
Large diameter sewers subjected to external pressure alone, are reinforced

Near the inner surface of the pipe
Near the outer surface of the pipe
With elliptical cage
Both A and B

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