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Mass Transfer

Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Danckwerts
Kissinevskii
Toor and Marchello
Higbie

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Mass Transfer
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

None of these
Molal
Relative
Percentage

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Mass Transfer
Tower diameter may be decreased by

Increasing the liquid flow rate
Using higher reflux ratio
Use of increased tray spacing
Increasing the vapour flow rate

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

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

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Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Less than that computed for ideality
None of these
Less than the sum of the vapour pressure of the components
Greater than that computed for ideality

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Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

√T
T⁴
T
T²

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