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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

2.65
2.5
2.55
2.25

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 2H3p/3 Z5
pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 3H3p/2 Z5

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

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

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Waste Water Engineering
Are available in size Stoneware sewers

20 cm
10 cm
15 cm
All of these

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

100 mg/l
300 mg/l
400 mg/l
200 mg/l

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Waste Water Engineering
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

Half full
Full depth
Three fourth full
Two third full

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