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Waste Water Engineering

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

Centrifugal pump
Air pressure pump
Reciprocating pump
Pneumatic ejector

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Waste Water Engineering
Hume steel pipes are

Steel pipes
Steel shell coated from inside with cement mortar
Both B and C
Steel shell coated from outside with cement mortar

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

Cleaner water
Active decomposition
Recovery
Degradation

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Waste Water Engineering
The quantity of liquid waste which flows in sewers during the period of rainfall, is known

Industrial waste
None of these
Sanitary sewage
Storm sewage

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Waste Water Engineering
The discharge per unit plan area of a sedimentation tank, is generally called

All of these
Over flow velocity
Over flow rate
Surface loading

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Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 218 (Gs – Gw)d [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]
Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw)d² [(3T + 70)/100]

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