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
Seamless pipe is made

From rolled strips formed into cylinders and seam-welded
By extrusion & casting into static and centrifugal molds
Both B and C
By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing

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