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

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

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Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Sensible heat differences are small, because the temperature changes from tray to tray is small
Trouton's rule is applicable
Liquid/vapor loading across the column remains constant
All of these

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