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Waste Water Engineering

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

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

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Waste Water Engineering
The most dangerous pollutant in vehicular emissions is

CO₂
CO₂
SO₂
O₂

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

213.5 cm/sec
313.5 cm/sec
500 cm/sec
413.5 cm/sec

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Waste Water Engineering
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

None of these
250 ppm
225 ppm
200 ppm

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Waste Water Engineering
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Manning
Kutter
Bazin
Chezy

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Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Rectangular
Horse shoe shaped
Egg shaped
Circular

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