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
Increases economy
Does not affect the capacity
Both B & C

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Process Equipment and Plant Design
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
Decreases upwards
Remains same throughout
Increases upwards

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