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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm²/seC₂
Cm/sec
Cm³/sec
Cm²/sec

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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
Both A & B
Rate of diffusion of the solute through the solid and into the liquid

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Mass Transfer
Flash distillation is suitable for separating the constituents of a binary system, which

Form minimum boiling azeotrope
Have very wide boiling points
Form constant boiling azeotrope
Have very close boiling points

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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

9
8
10
1

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Mass Transfer
For the same system, if the same liquid used in an absorber is decreased, the tower height will

Remain unaffected
Decrease or increase ; depends on the type of liquid
Decrease
Increase

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Mass Transfer
When an unsaturated air-water mixture is heated at constant pressure, then

The relative humidity increases
The specific humidity decreases
The relative humidity decreases
The partial pressure of water vapour increases

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