Process Equipment and Plant Design
In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current
Is always less than arithmetic average value
Is always less than arithmetic mean value, but more than geometric mean value
Is always more than arithmetic mean value and the geometric mean value

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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?

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

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