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

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

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Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Sensible heat differences are small, because the temperature changes from tray to tray is small
Trouton's rule is applicable
All of these
Liquid/vapor loading across the column remains constant

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