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

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

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

It is used for high viscosity liquor having large rate of scaling
There is no central downtake
The tube bundle is suspended on bracket
Downtake is formed by the annular space between the bundle and the shell

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