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

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

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Process Equipment and Plant Design
The function of manholes provided in the shell of a distillation column is to

Guard against foaming & entrainment by dumping antifoaming agent through it
Give access to the individual trays for cleaning, maintenance and installation
Keep a check on the liquid gradient over the plate by direct visual observation
All of these

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