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

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Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Geometric mean of the true temperature difference and the LMTD
Ratio of true temperature difference to the LMTD
Ratio of LMTD to the true temperature difference
Differenced of true temperature difference and the LMTD

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