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Waste Water Engineering

Waste Water Engineering
The sewerage system originates from

Main sewers
House sewers
Lateral sewers
Branch sewers

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.1 mm
Greater than 0.1 mm
Less than 0.01 mm
Less than 0.05 mm

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Waste Water Engineering
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

Kutter
Crimp and Bruges
Bazin
William-Hazen

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

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

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Waste Water Engineering
Sewer ventilating columns are generally placed at

All listed here
Every change in the size of sewers
Distances 150 m to 300 m
Upper ends of branch sewers

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Waste Water Engineering
For evaporation and measurement of settable solids, the apparatus used, is

An Imhoff cone
A test tube
A jar
A breaker

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