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

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

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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
Overall tray efficiency of a distillation column is the ratio of the number of

None of these
Real trays required to the number of ideal trays required
Overall gas transfer units to the number of ideal trays required
Ideal trays required to the number of real trays required

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