Question Bank • QB_DFE_UOP_007 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Unit Operations in Dairy and Food Engineering

Subtopic: Blanching

Question Statement:

Dühring's rule is widely applied in evaporator engineering design because it states that:

Options:

  • (A) The boiling temperature of a solution is a linear function of the boiling temperature of pure water at the same system pressure
  • (B) Steam economy is strictly equal to the number of effects minus one
  • (C) Liquid viscosity decreases exponentially with absolute pressure
  • (D) Evaporator heat transfer coefficient is inversely proportional to temperature difference

Answer Key:

A

Step-by-Step Solution & Explanation

Dühring's rule asserts that a straight-line relationship exists between the boiling point of a solution and the boiling point of pure water at the same pressure, providing a straightforward graphical tool for determining BPE across varying vacuum levels.
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