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Mass Transfer

Mass Transfer
Rayleigh's equation applies to __________ distillation.

Continuous
Differential
Flash
Steam

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Mass Transfer
The temperature of water cooled in cooling tower is always __________ temperature of entering air.

Equal to the dry bulb
More than the wet bulb
Equal to the wet bulb
Less than the wet bulb

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Mass Transfer
Surface renewal model of mass transfer was enunciated by

Toor and Marchello
Fick
Danckwerts
Stefan

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Mass Transfer
Back-trapping in a distillation column

Reduces pressure drop
Is desirable, as it provides improved vapour-liquid contact
Decreases tray efficiency
Increases tray efficiency

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Mass Transfer
Stage efficiency in a leaching process depends on the

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

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

10
8
9
1

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