Mass Transfer
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

Constant relative volatility
Constant molal overflow
Total reflux
All of these

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Mass Transfer
The McCabe Δ L law states that the

Molar heats of vaporisation of components are nearly equal
Linear crystal growth rate does not depend on the crystal size
Linear crystal growth rate depends on the degree of supersaturation
Linear crystal growth rate depends on the crystal size

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Mass Transfer
Bollman extractor

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

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