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Mass Transfer

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

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

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Mass Transfer
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.

Decreases
Does not affect
Exponentially increases
Increases

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Mass Transfer
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.

None of the listed here
Surface renewal
Penetration
Film

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Mass Transfer
Molecular diffusivity of a liquid

Increases with temperature
May increase or decrease with temperature
Is independent of temperature
Decreases with temperature

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Mass Transfer
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Constant rate
Both A & B
Neither A nor B
Unsaturated surface

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Mass Transfer
The most efficient cooling tower out of the following is

Atmospheric
Forced draft
Natural draft
Induced draft

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