Process Equipment and Plant Design
In case of a continuous distillation column, increase in reflux ratio may result in the

Lower fixed charges for the column
Greater cost for the condenser coolant
Greater cost for the reboiler heat supply
All of these

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

Disk and doughnut baffle is the most commonly used baffle
The minimum value of baffle spacing is 50 mm
The maximum value of baffle spacing is equal to the I.D. of the shell
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these

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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 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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