Process Equipment and Plant Design
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

Are easier to clean
None of these
Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
Are less prone to fouling

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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
The minimum value of baffle spacing is 50 mm
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

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