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

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

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Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
Both A & B
Economic limit reached, when the plant cost exceeds the saving of steam
Neither A nor B

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Process Equipment and Plant Design
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?

To provide support to the tube bundle
To increase the residence time of shell side fluid
To increase the tube side heat transfer co-efficient by inducing turbulence
To reduce the induced vibration in the tubes

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