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Waste Water Engineering

Waste Water Engineering
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

1.49 m
1.59 m
1.69 m
1.39 m

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Waste Water Engineering
The gas which may cause explosion in sewers, is

Methane
Carbon monoxide
Carbondioxide
Ammonia

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Waste Water Engineering
In sewers designed with self cleansing velocity,

Neither silting nor scouring occurs at the bottom
Both silting and scouring occur at the bottom
The bottom is silted
The bottom is scoured

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Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Recovery
Active decomposition
Degradation
Cleaner water

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Waste Water Engineering
Self-cleansing velocity is

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

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Waste Water Engineering
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

Hydrogen sulphide
Oxygen
Carbon dioxide
Methane

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