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

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Process Equipment and Plant Design
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

Are less prone to fouling
Are easier to clean
None of these
Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less

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