Mass Transfer
Bollman extractor

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

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Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
Actual humidity to saturation humidity

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