Process Equipment and Plant Design
The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.

Ellipsoidal
Flat plate
Hemispherical
Torispherical

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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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