Process Equipment and Plant Design
Floating head heat exchangers are used for the

Co-current heat transfer systems
Heat transfer between corrosive fluids
Cases where temperature difference between the shell and the tubes is more (>50°C)
Counter-current heat transfer systems

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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

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

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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
Downtake is formed by the annular space between the bundle and the shell
There is no central downtake
The tube bundle is suspended on bracket

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Process Equipment and Plant Design
Liquid gradient over a tray can be minimised by

Providing a higher skirt clearance or a higher weir
All of these
Using split flow, radial flow or cascade flow for column diameter large than 4 ft
Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must

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