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
Pick out the wrong statement pertaining to a shell and tube heat exchanger.

The maximum value of baffle spacing is equal to the I.D. of the shell
Disk and doughnut baffle is the most commonly used baffle
The minimum value of baffle spacing is 50 mm
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these

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