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

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

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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

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

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Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side, if the flow is counter-current and tube side if the flow is co-current
Shell side for smaller total pressure drop
Tubes to avoid the expansion of high pressure shell construction
Shell side for large overall heat transfer co-efficient

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