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 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

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Process Equipment and Plant Design
Pick out the wrong statement about the design of a sieve plate column.

An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns
Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds
For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design
Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns

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