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

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

None of these
Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up
If sufficient slot area is not provided, the gas may pass through the skirt clearance
The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

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