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Waste Water Engineering

Waste Water Engineering
Dried sewage after treatment is used as

Chemical for lowering B.O.D.
Fertilizer
Base material for paints
Building material

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

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Waste Water Engineering
Which one of the following part of human body withstands minimum radiation?

Thyroid
Ovaries/testis
Eyes
Kidneys

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05554 cumec
0.0556 cumec
0.05556 cumec
0.05552 cumec

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

Rectangular
Circular
Horse shoe shaped
Egg shaped

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Waste Water Engineering
The sewage is pumped up

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

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