Process Equipment and Plant Design
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

Running cost of steam for reboiler
Running cost of cooling water for condenser
Fixed charges initially
Vapour & liquid load both

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

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

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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
Hydrostatic head is required for refluxing the condensate
Sub cooling of condensate is desired
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 basket type evaporator.

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

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