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Waste Water Engineering

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

Ovaries/testis
Eyes
Thyroid
Kidneys

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Waste Water Engineering
Cement concrete sewers are only suitable if non-scouring velocity is between

3.5 to 4.5 m/sec
3.0 to 4.0 m/sec
2.5 to 3.0 m/sec
4.5 to 5.5 m/sec

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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
Rate of flow of sewage is generally assumed

More than the rate of water supply
Equal to the rate of water supply
At 150 litres per capita
Less than the rate of water supply

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Unexpected increase in the population
Under estimates of maximum and average flows
Unexpected large scale infiltration of stream water
All of these

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Waste Water Engineering
The gradient of sewers depends upon

Discharge
Diameter of the sewer
Velocity of flow
All listed here

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