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Waste Water Engineering

Waste Water Engineering
An inverted siphon is designed generally for

Four pipes
One pipe
Three pipes
Two pipes

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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

2 hours
4 hours
3 hours
5 hours

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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

0.15 cumec
0.10 cumec
0.20 cumec
0.12 cumec

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Waste Water Engineering
15 cumecs, the depth d and width are related by For drains up to

d = 0.5 B
B = 0.5 d
d = 0.2 B
B = 0.2 d

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Waste Water Engineering
Discrete or granular particles change their

None of these
Weight
Shape
Size

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

HCl
None of these
HNO₃
H₂SO₄

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