Mass Transfer
Stacked packing compared to dumped packing

Gives lower pressure drop
Gives higher pressure drop
Both A & B
Provides poorer contact between the fluids

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Mass Transfer
Flights in a rotary dryer are provided to

Increase the residence time of the solid
Reduce the residence time of solid
None of these
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas

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

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

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Temperature of the liquid phase is equal to that of the vapor phase
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
All of these

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