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

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

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
Is economical in operation
Both B & C
Employs high velocity, high heat transfer rate and less heating surface requirement

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