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

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

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Process Equipment and Plant Design
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Molar latent heat of the two components are equal
Sensible heat changes for vapour & liquid are negligibly small
Reflux is not a saturated liquid
Heat of mixing of normal liquid is assumed to be zero

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