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
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 less prone to fouling
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

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