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

The maximum value of baffle spacing is equal to the I.D. of the shell
The minimum value of baffle spacing is 50 mm
Disk and doughnut baffle is the most commonly used baffle
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
Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.

The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4
The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation
None of these
Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps

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Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side for smaller total pressure drop
Shell side for large overall heat transfer co-efficient
Tubes to avoid the expansion of high pressure shell construction
Shell side, if the flow is counter-current and tube side if the flow is co-current

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