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Waste Water Engineering

Waste Water Engineering
The grit and silt of the grit chambers, may not be used for

Both A and B
Concreting
Raising low lying areas by dumping
Neither A nor B

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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
0.20 cumec
0.15 cumec
0.10 cumec

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

3
2
2.5
1.5

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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

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

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Waste Water Engineering
For efficient working of a sewer, it must be ensured that

A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
Both (A) and (B)
Neither (A) nor (B)

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Waste Water Engineering
The use of coarse screens for the disposal of sewage, may be dispensed with by

Neither A nor B
Comminutor
Shredder
Both A and B

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