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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ D1.5
K ∝ D
K ∝ D2
K ∝ √D

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Mass Transfer
Dry bulb temperature of the gas is __________ the wet bulb temperature.

Equal to
More than
None of these
Less than

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Mass Transfer
Overall efficiency of the distillation column is

Always more than the point efficiency
The ratio of number of ideal plates to actual plates
The ratio of number of actual plates to ideal plates
Same as the Murphree efficiency

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Mass Transfer
Pick out the system with maximum boiling azeotrope at 1 atm.

Benzene-ethyl alcohol
Ethyl alcohol-water
Acetone chloroform
None of these

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Mass Transfer
With increase in the concentration of the adsorbate, the integral heat of adsorption

Remains unchanged
Increases
May increase or decrease ; depends on the type of adsorbate
Decreases

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Mass Transfer
In liquid extraction, if the selectivity is unity, then

No separation will occur
Separation of the constituents is the most effective
Solvent flow rate should be very low
Amount of solvent required will be minimum

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