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Waste Water Engineering

Waste Water Engineering
The sewer pipe which carries sewage from a building for immediate disposal is

Intercepting sewer
Main sewer
House sewer
Lateral sewer

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Waste Water Engineering
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

20 cm
25 cm
40 cm
50 cm

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Waste Water Engineering
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

0.1
0.05
0.25
0.5

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Waste Water Engineering
In sewage, the solids in mg per litre is

100 to 500
1000 to 1500
1500 to 2000
500 to 1000

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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
Carbon dioxide
Methane
Oxygen

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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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