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Mass Transfer

Mass Transfer
The value of L/mG ratio for economical absorption operation ranges from

0.5 to 0.8
2.5 to 3.5
1.25 to 2.0
0.8 to 1.2

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Mass Transfer
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.

Film
None of these
Penetration
Surface renewal

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Mass Transfer
Stage efficiency in a leaching process depends on the

Vapour pressure of the solution
Time of contact between the solid and the solution
Rate of diffusion of the solute through the solid and into the liquid
Both A & B

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Mass Transfer
Molecular diffusivity of a liquid

May increase or decrease with temperature
Is independent of temperature
Decreases with temperature
Increases with temperature

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Mass Transfer
During the constant rate period of drying of a solid,

Surface evaporation of unbound moisture occurs
None of these
Increased air humidity decreases the rate of drying
Increasing the air temperature decreases the drying rate

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Mass Transfer
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)

Log P vs . T
T vs . P
P vs . log T
Log P vs. log T

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