Process Equipment and Plant Design
Bubble cap tray is the most commonly used tray in large distillation column, because

It eliminates the foaming and entrain-ment tendency during operation
Of its flexibility and nearly constant efficiency under varying conditions of operation
It incurs less pressure drop as compared to any other try designed for the same duty
None of these

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

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