Process Equipment and Plant Design
Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

Sorel-Lewis method
Ponchon-Savarit method
McCabe-Thiele's method
None of these

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

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