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Mass Transfer

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

K ∝ D2
K ∝ √D
K ∝ D1.5
K ∝ D

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Increased relative volatility
Thermal decomposition of bottoms
Erosion of the tower
Very efficient operation

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Mass Transfer
Absorption accompanied by heat evolution results in

None of these
Increase in equilibrium solubility
Decrease in equilibrium solubility
Increased capacity of the absorber

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Mass Transfer
For a distillation column operating at minimum reflux, the

None of these
Reflux ratio will be maximum
Number of plates required will be maximum
Concentration of liquid and vapour leaving a plate will be same

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Mass Transfer
Rayleigh's equation applies to __________ distillation.

Steam
Differential
Flash
Continuous

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

Decreases
Increases
Exponentially increases
Does not affect

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