Mass Transfer
Which of the following is not a batch drier?

Agitated pan drier
Truck drier
Fluidised bed drier
Vacuum shelf drier

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Mixture (to be separated) shows negative deviation from ideality
Relative volatility is reasonably constant
Mixture (to be separated) shows positive deviation from ideality
Multicomponent distillation is involved

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