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

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

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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?

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

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

More than the tube diameter
Equal to the tube diameter
Not less than one-fourth of the tube diameter or 3/16"
More in case of triangular pitch as compared to the square pitch tube layout

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