Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Overall gas transfer units to the number of ideal trays required
Ideal trays required to the number of real trays required
Real trays required to the number of ideal trays required
None of these

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Process Equipment and Plant Design
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

None of these
Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
Are less prone to fouling
Are easier to clean

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