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Waste Water Engineering

Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/2
D/4
D/3
D/1

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Waste Water Engineering
Oxidation process results in the formation of

All of these
Nitrates
Carbon dioxide
Sulphates

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Waste Water Engineering
Dry water flow in a combined sewer, is

Inclusive of domestic and industrial sewage but excludes storm water
Domestic sewage
Storm water
Industrial sewage

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Waste Water Engineering
Fresh sewage may become stale in

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

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Waste Water Engineering
Imhoff cone is used to determine

None of these
Settleable solids
Dissolved solids
Suspended solids

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

4 to 8 hours
8 to 16 hours
24 to 36 hours
16 to 24 hours

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