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Waste Water Engineering

Waste Water Engineering
Water content of sewage is about

0.99
0.95
0.999
0.9

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Waste Water Engineering
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

1.39 m
1.59 m
1.69 m
1.49 m

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.12 cumec
0.10 cumec
0.20 cumec
0.15 cumec

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Waste Water Engineering
The average temperature of sewage in India, is

10°C
25°C
15°C
20°C

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

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

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Waste Water Engineering
The factor responsible for purification of sewage in river is

Hydrology
Dissolved oxygen in water
All listed here
Temperature

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