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Mass Transfer

Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
2.5
1.25
0.0025

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Mass Transfer
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

Evaporation
Absorption
Liquid extraction
Distillation

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Mass Transfer
Desulphurisation of petrol is done in a

Rotating disc extractor
Packed extraction column
Plate type extraction column
Bollman extractor

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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 momentum
Mass and momentum
Heat and mass

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Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Feed composition
Allowable gas velocity
Allowable liquid velocity
Allowable gas and liquid velocities

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Mass Transfer
The solvent used in liquid-liquid extraction should have __________ less than one.

Both A & B
Distribution co-efficient
Neither A nor B
Selectivity

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