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
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

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Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Preferably flow inside the tube for its easier internal cleaning
Flow at a very slow velocity
Perferably flow outside the tube

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