Mass Transfer
Minimum reflux ratio in a distillation column results in

Maximum condenser size
Optimum number of trays
Minimum reboiler size
Minimum number of trays

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Mass Transfer
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

The product composition but not the fraction vaporised
The fraction vaporised but not the product composition
Neither the product composition nor the fraction vaporised
The product composition as well as the fraction vaporised

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Mass Transfer
In case of a desorber (stripper), the

Operating line always lies below the equilibrium curve
Operating line always lies above the equilibrium curve
Temperature always increases
Temperature remains unaffected

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