Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

All of these
Sensible heat differences are small, because the temperature changes from tray to tray is small
Liquid/vapor loading across the column remains constant
Trouton's rule is applicable

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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 mean value, but more than geometric mean value
Is always more than arithmetic mean value and the geometric mean value
Is always less than arithmetic average value

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

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to shell and tube heat exchanger.

Bracket supports are used for horizontal shell, while saddle support is used for vertical shell
Baffles are supported independently of the tubes by tie rods and positioned by spacers
Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter
Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle

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