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

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

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Ideal trays required to the number of real trays required
Overall gas transfer units to the number of ideal trays required
None of these
Real trays required to the number of ideal trays required

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