Process Equipment and Plant Design
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

Plate spacing
All of these
Diameter of the column
Allowable gas velocity through the slots

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

It is used for high viscosity liquor having large rate of scaling
There is no central downtake
Downtake is formed by the annular space between the bundle and the shell
The tube bundle is suspended on bracket

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