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

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Employs high velocity, high heat transfer rate and less heating surface requirement
Both B & C
Is economical in operation
Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

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