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Waste Water Engineering

Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Heart disorder
Skin cancer
Lung cancer
Bronchitis

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Waste Water Engineering
The first stage of neutral process of sludge digestion, is

Alkaline fermentation
Acid fermentation
None of these
Acid regression

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Waste Water Engineering
The gradient of sewers depends upon

All listed here
Discharge
Diameter of the sewer
Velocity of flow

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Waste Water Engineering
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

0.25
5
10
2

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Waste Water Engineering
Self-cleansing velocity is

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

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Unexpected increase in population
Large scale infiltration of storm water
Low estimates of the average and maximum flows
All listed here

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