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Waste Water Engineering

Waste Water Engineering
The rational formula for peak drainage discharge, was evolved by

Lloyd David
Kuichling
Fruhling
All of these

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

Screening
Oxidation
All listed here
Sedimentation

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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

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

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Waste Water Engineering
The design period in years for pumping plants, is

3 to 5
5 to 10
1
2 to 3

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Waste Water Engineering
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Dissolved Oxygen (D.O.)
None of these
Bio-Chemical Oxygen Demand (B.O.D.)
Chemical Oxygen Demand (C.O.D.)

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Waste Water Engineering
Aerobic bacterias

Flourish in the presence of free oxygen
Consume organic matter as their food
All of these
Oxidise organic matter in sewage

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