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Waste Water Engineering

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

Acid regression
Alkaline fermentation
None of these
Acid fermentation

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Waste Water Engineering
The use of coarse screens for the disposal of sewage, may be dispensed with by

Neither A nor B
Both A and B
Shredder
Comminutor

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Waste Water Engineering
The most widely used pump for lifting sewage is

Reciprocating pump
Pneumatic ejector
Air pressure pump
Centrifugal pump

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

100
5000
10000
1000

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Waste Water Engineering
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

100 mm dia
150 mm dia
225 mm dia
All of these

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Waste Water Engineering
Self-cleansing velocity is

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

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