Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Only the function of condensation is to be carried out
Sub cooling of condensate is desired
Hydrostatic head is required for refluxing the condensate
Both the functions of condensation & sub cooling are carried out in a single unit

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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 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
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

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Process Equipment and Plant Design
Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

Number of equilibrium stages in only stripping section is to be calculated
Number of equilibrium stages required is likely to be very small
Feed is not at its bubble point
Relative volatility is close to one (e.g., separation of close boiling isomers)

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