The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?
Correct answer: A. Solution has an elevation of boiling point
- A. Solution has an elevation of boiling point
- B. Evaporators operate under vacuum
- C. Evaporators operate at atmospheric pressure
- D. None of these
Explanation
A solution's boiling-point elevation reduces the effective temperature difference available in each effect, so the double-effect capacity can fall below half the combined capacity of two comparable single effects. Vacuum or atmospheric operation alone does not cause this specific reduction.
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