Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Lower skirt clearance
Lower static submergence
Liquid gradient on the tray
Small downcomer liquid seal

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

It is suitable for process, in which the final product is a liquor instead of solid
Liquor flows inside the tube, while the steam is outside submerging the tube
It is unsuitable for concentrating those liquids, which form a scale or deposit salt
Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

None of these
Tube dia is 3-6 cms, while tube length in 3-6 metres
Steam is fed to the shell, whereas the liquor is filled inside the tube
Liquor level is maintained at l/3rd to 1/2 of the height of the tube

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