The actual temperature drop across the heating surface of an evaporator depends on the_______________?
Correct answer: D. All A., B. and C.
- A. Liquid depth over the heating surface
- B. Solution being evaporated
- C. Pressure difference between the steam chest and the vapor space above the boiling liquid
- D. All A., B. and C.
Explanation
The effective temperature drop includes the steam-to-vapour pressure difference, boiling-point elevation caused by the solution, and hydrostatic pressure from liquid depth. Therefore all three factors affect it.
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