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Mass Transfer

Mass Transfer
A good solvent used for absorption should not have very high

Viscosity
Freezing point
Vapor pressure
All of these

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ √D
K ∝ D1.5
K ∝ D2
K ∝ D

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Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Relative humidity of outlet air
Temperature of the solid
Flow rate of inlet air
Humidity of inlet air

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Mass Transfer
__________ is concerned with the adsorption equilibria.

None of these
Fick's law
Gibb's equation
Freundlich equation

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Mass Transfer
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Decrease
Depend on saturated boiling point; may increase or decrease
Remains same
Increase

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Mass Transfer
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.

Exponentially increases
Does not affect
Increases
Decreases

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