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Mass Transfer

Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ P0.5
D ∝ 1/P1.5
D ∝ 1/P0.5
D ∝ 1/P

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Mass Transfer
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.

Surface renewal
Film
None of these
Penetration

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Mass Transfer
Large scale usage of flash distillation is practised in

Ammonia synthesis plant
Polymerisation industry
Petroleum refinning
Soap manufacturing

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Mass Transfer
Make up water is required in a cooling tower to replace the water lost by

Drift
Evaporation
All of these
Blowdown and leakage

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Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

1/f
F
2f
F/2

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 - Re)
Ri = Re/(1 + Re)
Ri = Re
Ri = (1 - Re)/Re

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