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Mass Transfer

Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

-1.5
-0.6
0.6
1.5

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Mass Transfer
Stage efficiency in a leaching process depends on the

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

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Mass Transfer
Mechanism of moisture removal in case of freeze drying of food stuff is by

Sublimation
Evaporation
Adsorption
Dehydration

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Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Operating line lies below the equilibrium line
Operating line lies above the equilibrium line
Pressure drop in the column is very high
Both operating and equilibrium lines are parallel

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Mass Transfer
Separation of two volatile liquids by distillation makes use of their

Density difference
Solubility
Selectivity
Relative volatility

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Mass Transfer
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Remains same
Depend on saturated boiling point; may increase or decrease
Increase
Decrease

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