Process Equipment and Plant Design
The main purpose of providing stepping on the trays is to

Improve the flow condition
Facilitate handling of large flow rate of liquid
Decrease the pressure drop
Increase the residence time

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

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

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