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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
Design calculation for multiple component distillation is done by

Enthalpy concentration method
Ponchon-Savarit method
Mccabe-Thiele method
Tray to tray calculations

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Mass Transfer
As per Gilliland's equation, the diffusivity is

Directly proportional to 'T1.5'
Dependent on the molecular volume & molecular weight of components
All of these
Inversely proportional to 'P'

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Mass Transfer
Which of the following solutions will follow Raoult's law most closely?

35% solution of camphor in water
A solution of polar organic compounds (not of homologs of a series)
A solution of benzene, toluene and oxylene
35% solution of NH₃ in water

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Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Decreases
Remains unchanged
Increases
Depends on the pressure of the system

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Mass Transfer
At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.

100
50
Between 0 and 100

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