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Waste Water Engineering

Waste Water Engineering
The design period in years for pumping plants, is

1
5 to 10
2 to 3
3 to 5

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Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Horse shoe shaped
Rectangular
Egg shaped
Circular

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Waste Water Engineering
Fresh sewage is generally

A source of objectionable odour
Alkaline
Highly decomposed
Acidic

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

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

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

20% less
20% more
10% more
10% less

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

100 mg/l
400 mg/l
200 mg/l
300 mg/l

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