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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

1 in 60
None of these
1 in 100
1 in 120

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

Maximum horizontal flow velocity is limited to 0.3 m/minute
Length of the tank is normally kept 4 to 5 times the width
All listed here
Width of the tank is normally kept about 6 m

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Waste Water Engineering
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

75 m
30 m
20 m
45 m

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Waste Water Engineering
The sewer that unloads the sewage at the point of treatment is called

Outfall sewer
Branch sewer
Main sewer
House sewer

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Waste Water Engineering
The gas which may cause explosion in sewers, is

Ammonia
Methane
Carbon monoxide
Carbondioxide

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Waste Water Engineering
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

1.36 m
0.68 m
0.88 m
1.76 m

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