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Mass Transfer

Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

0.01
0.1
10-5 to 10-6
> 1

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Mass Transfer
Reboiler is considered as one theoretical plate, because

Reboiler itself contains one plate
None of these
Vapour is recycled to the column
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

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Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

-0.6
1.5
0.6
-1.5

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Mass Transfer
The humid volume may be increased by increasing the

Humidity at constant temperature
Temperature at constant humidity
Neither A nor B
Both A & B

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

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

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Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Relative humidity
Wet bulb temperature
Partial pressure of water vapor
None of these

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