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Waste Water Engineering

Waste Water Engineering
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.25
2.65
2.5
2.55

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Waste Water Engineering
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Chemical Oxygen Demand (C.O.D.)
Dissolved Oxygen (D.O.)
None of these
Bio-Chemical Oxygen Demand (B.O.D.)

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Waste Water Engineering
A rain sanitary sewer is constructed to carry

Ground water
Storm sewage
Sanitary sewage
Surface water

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Waste Water Engineering
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

Depressed sewer
Sag pipe
all of these
Inverted syphon

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Waste Water Engineering
The spacing of bars of perforations of fine screens used for the treatment of sewage, is

3 to 5 mm
5 to 8 mm
8 to 10 mm
2 to 3 mm

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Waste Water Engineering
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

1.5 D
1.25 D
1.15 D
1.75 D

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