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

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
Neither A nor B

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

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