Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Is equal to the volumetric diffusivity
Varies inversely as the pressure
Is independent of pressure
Varies directly as the pressure

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Mass Transfer
Plate efficiency

Is a function of the mass transfer between liquid and vapour
Increases due to foaming
Increases due to liquid entrainment
Increases due to weeping and dumping of liquid

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Mass Transfer
Flights in a rotary dryer are provided to

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

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Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points
Driving force for the vapour flow is the pressure drop
Pressure increases gradually from bottom to the top of the column
None of these

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