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Mass Transfer

Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around

0.6
1
0.72
0.24

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Mass Transfer
Removal of __________ exemplifies an adsorption unit operation.

Water from petrol
Uranium from its ore
None of the listed here
Ammonia from coke oven gas

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

Proportional to √D
Dependent on the Reynolds number
D/a
D/2a

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Mass Transfer
Molecular diffusivity of a liquid

Is independent of temperature
Increases with temperature
May increase or decrease with temperature
Decreases with temperature

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Mass Transfer
Inside the distillation columns, the

Driving force for the liquid flow is its weight
Vapors are not always at their dew points
All of these
Highest temperatures is near the feed plate

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Mass Transfer
Ammonia present in the coke oven gas is removed by washing with

Dilute ammoniacal liquor
Caustic solution
Ethanolamine
Dilute HCl

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