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

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

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

Not less than one-fourth of the tube diameter or 3/16"
More than the tube diameter
Equal to the tube diameter
More in case of triangular pitch as compared to the square pitch tube layout

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