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

Surface renewal
Penetration
Film
None of the listed here

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
Only vapor phase follows Raoult's law
Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Only liquid phase obeys Dalton's law

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Mass Transfer
Bollman extractor

Is a centrifugal extractor
Employs only counter-current extraction
Is used for extraction of oil from oilseed
Is a static bed leaching equipment

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