Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up
None of these
If sufficient slot area is not provided, the gas may pass through the skirt clearance
The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
Employs high velocity, high heat transfer rate and less heating surface requirement
Both B & C
Is economical in operation

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