Mass Transfer
The minimum number of theoretical plates is required for achieving a given separation in distillation column with

No reflux
Total reflux
Minimum reflux ratio
Zero reflux ratio

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Increases pressure drop, increases surface area
Increases pressure drop, decreases surface area
Decreases pressure drop, increases surface area
Decreases pressure drop, decreases surface area

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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 fraction vaporised but not the product composition
The product composition but not the fraction vaporised
The product composition as well as the fraction vaporised

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