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Waste Water Engineering

Waste Water Engineering
The sewer which received discharge from two or more main sewers, is known as

A trunk sewer
An intercepting sewer
An outfall sewer
A main sewer

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

Acid regression
Acid fermentation
Alkaline fermentation
None of these

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

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Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Cleaner water
Recovery
Active decomposition
Degradation

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Waste Water Engineering
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

225 ppm
200 ppm
None of these
250 ppm

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Waste Water Engineering
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

Sag pipe
Inverted syphon
all of these
Depressed sewer

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