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Mass Transfer

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

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

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Mass Transfer
Agitator is provided in a crystalliser for

Crystal growth
Formation of nuclei
All of these
Avoiding deposition on cooler surfaces

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Mass Transfer
Tower diameter may be decreased by

Increasing the liquid flow rate
Use of increased tray spacing
Using higher reflux ratio
Increasing the vapour flow rate

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Mass Transfer
Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.

Between 100 and 210
None of the listed here
At < 100
At > 210.6

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Mass Transfer
During the constant rate period of drying of a solid,

None of these
Surface evaporation of unbound moisture occurs
Increased air humidity decreases the rate of drying
Increasing the air temperature decreases the drying rate

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

10
1
5
100

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