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Mass Transfer

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

Danckwerts
Toor and Marchello
Higbie
Kissinevskii

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Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.079
0.122
0.152
0.048

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Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Inorganic solids
Rag paper
Anthracite coal
Bamboo

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Mass Transfer
At a fixed total pressure, humidity depends only on the

None of these
Heat capacity of the vapour
Partial pressure of vapour in the mixture
Density of the vapour

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Mass Transfer
In case of absorption, both the operating and equilibrium lines will be straight for

None of these
Dilute solutions
Isothermal operation
Dilute solutions and isothermal operation

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Mass Transfer
The reciprocal of stripping factor is termed as

Selectivity index
Relative volatility
Absorption factor
Murphree efficiency

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MORE MCQ ON Mass Transfer

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