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Waste Water Engineering

Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

None of these
Seas
Lakes
Rivers

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

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

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Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

1 in 100
1 in 120
1 in 60
None of these

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Waste Water Engineering
No treatment of the sewage is given if dilution factor is

Between 200 to 300
More than 500
Between 150 to 200
Less than 150

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Waste Water Engineering
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

Q/(L × D)
Q/(B × D)
Q/(B × L)
Q/L

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Waste Water Engineering
At the junction of sewers

Top of smaller sewer is kept lower
Tops of both the sewers are at the same level
Top of larger sewer is kept lower
None of these

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