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

The minimum value of baffle spacing is 50 mm
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
The maximum value of baffle spacing is equal to the I.D. of the shell
Disk and doughnut baffle is the most commonly used baffle

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.

The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty
Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids
Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution
In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes

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