Mass Transfer
Swenson-Walker crystalliser is a __________ unit

Cooling (adiabatic)-cum-evaporation
Batch
Continuous
Semi-batch

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Only vapor phase follows Raoult's law
Only liquid phase obeys Dalton's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law

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Mass Transfer
When the solvent dissolves very little of solute, then

Solvent of low freezing point should be used
Large quantity of solvent is required to extract the solute
Very small quantity of solvent is required
Solvent of low latent heat of vaporisation should be used

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