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Mass Transfer

Mass Transfer
The fixed cost of a distillation column at minimum reflux ratio is

Minimum
Optimum
Infinite
None of these

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Mass Transfer
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

Packed
Bubble cap
Perforated tray
Wetted wall

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Mass Transfer
Which of the following is an undesirable characteristic for the solvent used in gas absorption?

Low viscosity
None of these
Low vapor pressure
High gas solubility

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Mass Transfer
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Increases
Decreases
Remains same
Either A or B; depends on the gas

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P1.5
D ∝ P0.5
D ∝ 1/P
D ∝ 1/P0.5

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Mass Transfer
The commonly used solvent in supercritical extraction is

Carbon dioxide
Carbon tetrachloride
Water
Methyl ethyl ketone

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