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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ √D
K ∝ D
K ∝ D2
K ∝ D1.5

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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?

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

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Mass Transfer
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

Decreases
Decreases linearly
Increases
Remains unaffected

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Mass Transfer
__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

Benzol
Furfural
Butyl acetate
Hexane

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Mass Transfer
Surface renewal model of mass transfer was enunciated by

Toor and Marchello
Fick
Stefan
Danckwerts

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Mass Transfer
What is the degree of freedom of an absorption process in which only one component is transferred between phases?

4
3
2
1

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