Process Equipment and Plant Design
Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation

Increases capacity
Both B & C
Does not affect the capacity
Increases economy

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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?

Reflux is not a saturated liquid
Heat of mixing of normal liquid is assumed to be zero
Molar latent heat of the two components are equal
Sensible heat changes for vapour & liquid are negligibly small

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