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Mass Transfer

Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Toor and Marchello
Higbie
Danckwerts
Kissinevskii

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Mass Transfer
During constant rate period, the rate of drying decreases with the

Neither A nor B
Increase in air humidity
Both A & B
Decrease in air temperature

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Mass Transfer
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

None of these
Relative
Percentage
Molal

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Mass Transfer
The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same.

Heat, momentum and mass
Heat and mass
Heat and momentum
Mass and momentum

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Mass Transfer
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

Decoction
Percolation
Elutriation or elution
None of these

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Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

KL².DA
√(KL².DA)
KL²/DA
KL/DA²

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