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

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

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Sub cooling of condensate is desired
Both the functions of condensation & sub cooling are carried out in a single unit
Hydrostatic head is required for refluxing the condensate
Only the function of condensation is to be carried out

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