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Waste Water Engineering

Waste Water Engineering
During purification process of sewage the gas given off, is

All listed here
Ammonia
Carbon dioxide
Hydrogen

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Waste Water Engineering
For design purposes, the normal rate of infiltration of ground water into the sewer, is

1000 litres/km/cm
2000 litres/km/cm
500 litres/km/cm
1500 litres/km/cm

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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

Carbon dioxide
Hydrogen sulphide
Methane
Oxygen

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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
Q/(B × L)
Q/(L × D)
Q/(B × D)

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

Active decomposition
Degradation
Recovery
Cleaner water

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Waste Water Engineering
In olden days the type of section adopted in trunk and out fall sewers was

Circular shaped
Horse shoe shaped
Parabolic shaped
Egg shaped

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