Process Equipment and Plant Design
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

All of these
Diameter of the column
Allowable gas velocity through the slots
Plate spacing

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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

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

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