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

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

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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
Liquid/vapor loading across the column remains constant
All of these
Trouton's rule is applicable

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