Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Geometric mean of the true temperature difference and the LMTD
Differenced of true temperature difference and the LMTD
Ratio of LMTD to the true temperature difference
Ratio of true temperature difference to the LMTD

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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
Both A & 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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