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Mass Transfer

Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

T3/2 and T
√T and T3/2
T3/2 and √T
T and T3/2

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Mass Transfer
Dimension of mass diffusivity is the same as that of

Dynamic viscosity
Kinematic viscosity
Surface tension
Pressure

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Does not affect the moisture content of the wet solid
Increases with time
Does not change with time
Decreases with time

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Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Interface
Liquid phase
Gas phase
All of these

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Mass Transfer
Small dia distillation column can be a

Sieve tray
Bubble cap
Packed column
Any of these

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Mass Transfer
For the same process conditions, the reflux ratio of an unlagged distillation column

Increases in winter
None of these
Increases in summer
Decreases in winter

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