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

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

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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?

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

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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
All of these
Give access to the individual trays for cleaning, maintenance and installation
Guard against foaming & entrainment by dumping antifoaming agent through it

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