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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

D2
D
1/D
D0.5

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Mass Transfer
If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are

Neither A nor B
Straight
Parallel
Both A & B

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Mass Transfer
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.

Increases with increase in
Both A and B
Is one at unity value of
Neither A nor B

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Mass Transfer
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

Constant relative volatility
All of these
Total reflux
Constant molal overflow

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Mass Transfer
Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Stanton
Schmidt
Sherwood
Peclet

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Mass Transfer
Which of the following is an undesirable characteristic for the solvent used in gas absorption?

High gas solubility
Low viscosity
Low vapor pressure
None of these

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