Mass Transfer
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams

Remains unaffected
Decreases
Increases
Passes through a maximum

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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

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

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Mass Transfer
Channelling is most severe

In towers packed randomly with crushed solids
At very high liquid flow rate
In dumped packing of regular units
In towers packed with stacked packing

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