Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Weir height for a bubble cap plate column is the same as that for a seive plate column
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
Weir length for a bubble cap plate is the same as that for the seive plate

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Process Equipment and Plant Design
Liquid gradient over a tray can be minimised by

Using split flow, radial flow or cascade flow for column diameter large than 4 ft
Providing a higher skirt clearance or a higher weir
All of these
Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must

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Process Equipment and Plant Design
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?

To increase the residence time of shell side fluid
To provide support to the tube bundle
To reduce the induced vibration in the tubes
To increase the tube side heat transfer co-efficient by inducing turbulence

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