Mass Transfer
Swenson-Walker crystalliser is a __________ unit

Semi-batch
Cooling (adiabatic)-cum-evaporation
Continuous
Batch

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

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

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