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
In a vertical short tube evaporator (Calendria type), the

All of these
Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
Liquor is inside the tube while the steam is outside the tube

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