Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
Both A & B
Neither A nor B
Economic limit reached, when the plant cost exceeds the saving of steam

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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?

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
Reflux is not a saturated liquid

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