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Waste Water Engineering

Waste Water Engineering
The most dangerous pollutant in vehicular emissions is

CO₂
O₂
CO₂
SO₂

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Waste Water Engineering
Fresh sewage may become stale in

One hour
Three to four hours
Two to three hours
Six hours

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Waste Water Engineering
Design period of 40 to 50 years is adopted for

Trunk sewers
All listed here
Branch sewers
Main sewers

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Waste Water Engineering
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

5.5 m
5 m
7 m
6.5 m

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.74 D
D’ = 0.94 D
D’ = 0.64 D
D’ = 0.84 D

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Waste Water Engineering
In a trickling filter

Filtration process is used
Biological action is used
Neither A nor B
Both A and B

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