Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Liquid/vapor loading across the column remains constant
Trouton's rule is applicable
All of these
Sensible heat differences are small, because the temperature changes from tray to tray is small

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

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

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