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
Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
Economic limit reached, when the plant cost exceeds the saving of steam
Both A & B

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Process Equipment and Plant Design
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

Increases upwards
May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
Remains same throughout
Decreases upwards

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Is economical in operation
Employs high velocity, high heat transfer rate and less heating surface requirement
Both B & C
Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

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