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Waste Water Engineering

Waste Water Engineering
The sewage is pumped up

From basements
All listed here
From low lying areas
From flat areas

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Waste Water Engineering
Inter-distance between ventilation columns in a sewer line is kept

150 m to 300 m
100 m to 150 m
50 m to 100 m
25 to 50 m

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.10 cumec
0.12 cumec
0.20 cumec
0.15 cumec

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Waste Water Engineering
Fresh sewage may become stale in

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

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Waste Water Engineering
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

Hydrochloric acid
Sulphuric acid
Citric acid
Nitric acid

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Waste Water Engineering
Self-cleansing velocity is

Velocity of water at flushing
Velocity at which no accumulation remains in the drains
Velocity at dry weather flow
Velocity of water in a pressure filter

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MORE MCQ ON Waste Water Engineering

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