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Waste Water Engineering

Waste Water Engineering
Discrete or granular particles change their

Weight
Shape
Size
None of these

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Waste Water Engineering
With self cleansing velocity in sewers

Both silting and scouring occur at bottom
Silting occurs at bottom
Scouring occurs at bottom
Neither silting nor scouring occurs at bottom

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Waste Water Engineering
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

5 hours
2 hours
3 hours
4 hours

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

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

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

150 ppm
100 ppm
200 ppm
50 ppm

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Waste Water Engineering
The following is the physical characteristic of sewage

Odour
Colour
All listed here
Turbidity

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