Process Equipment and Plant Design
Theoretically calculated diameter of the stripping section of the continuous rectification column is __________ that of the enriching section.

Same as
Less than
More than
Either more or less (depending upon relative volatility)

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Process Equipment and Plant Design
Pick out the wrong statement about the design of a sieve plate column.

An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns
For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design
Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds
Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Ideal trays required to the number of real trays required
Real trays required to the number of ideal trays required
Overall gas transfer units to the number of ideal trays required
None of these

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