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

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

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Sub cooling of condensate is desired
Hydrostatic head is required for refluxing the condensate
Both the functions of condensation & sub cooling are carried out in a single unit
Only the function of condensation is to be carried out

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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?

Molar latent heat of the two components are equal
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

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