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Waste Water Engineering

Waste Water Engineering
The sewer which resists sulphide corrosion, is

Lead sewer
Brick sewer
Cast iron sewer
R.C. sewer

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Waste Water Engineering
In trickling filter, B.O.D. is reduced to

60 to 80%
40 to 60%
80 to 90%
30 to 40%

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

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

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

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Waste Water Engineering
The temperature affects the

Viscosity of sewage
All of these
Biological activity of bacteria in sewage
Solubility of gases in sewage

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Waste Water Engineering
‘Cowl’ is provided at

Upper end of the manhole
Lower end of ventilating column
Upper end of ventilating column
First step in manhole

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