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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

5 to 10
1 to 5
> 10
1

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Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

Distillation
Absorption
Solvent extraction
None of these

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Mass Transfer
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.

Bound
Free
Equilibrium
Unbound

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Mass Transfer
Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.

Vacuum
Rotary
Tray
Tunnel

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Mass Transfer
The rate of mass transfer is not dependent upon the

Interfacial surface exposed between the phases
None of these
Both A & B
Degree of dispersion of one fluid in the other

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 - Ro) = Ro/Ri
(1 + Ro) = Ro/Ri
(1 + Ri) = Ro/Ri
(1 - Ri) = Ro/Ri

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