Mass Transfer
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.

Film
Penetration
Surface renewal
None of these

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Mass Transfer
In a counter-current liquid extractor

Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids flow at fixed rate
Both liquids can have any desired flow rate

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Uses molal units for material and energy balance
Can use any type of units
Is more accurate than Ponchan-Savarit method

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