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
Real trays required to the number of ideal trays required
None of these
Ideal trays required to the number of real trays required

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Process Equipment and Plant Design
In the design of a shell and tube heat exchanger, the corrosion allowance

All of these
For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm
For internal cover and tube sheet is provided on both the sides
Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc

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