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Waste Water Engineering

Waste Water Engineering
Sewer pipes need be checked for

None of these
Maximum flow
Minimum flow
Both A and B

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Unexpected increase in population
Large scale infiltration of storm water
All listed here
Low estimates of the average and maximum flows

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Waste Water Engineering
The formula V = (1/n) r2/3

Chezy’s formula
Bazin’s formula
Manning’s formula
Kutter’s formula

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

8 to 16 hours
4 to 8 hours
16 to 24 hours
24 to 36 hours

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d² (0.011d + 0.785H)/Q
d (0.785d + 0.011H)/Q
d (0.285d + 0.011H)/Q
d (0.022d + 0.085H)/Q

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

None of these
A particle to travel along its length
A particle to travel from top surface to bottom sludge zone
The flow of sewage to fill the tank

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