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

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

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Process Equipment and Plant Design
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Heat of mixing of normal liquid is assumed to be zero
Molar latent heat of the two components are equal
Reflux is not a saturated liquid
Sensible heat changes for vapour & liquid are negligibly small

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