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Mass Transfer

Mass Transfer
Large scale drying of wheat is done in a __________ dryer.

Vacuum rotary
Tray
Fluidised bed
Spouted bed

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Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

0.54
1.04
1.24
1.94

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Mass Transfer
COâ‚‚ can be absorbed by

Hot cupric oxide
Heated charcoal
Alumina
Cold Ca(OH)â‚‚

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Momentum diffusivity to thermal diffusivity
Thermal diffusivity to mass diffusivity
None of these
Mass diffusivity to momentum diffusivity

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

D0.5
D
D2
1/D

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

Furfural
Butyl acetate
Benzol
Hexane

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