Question Bank • QB_DFE_EXP_104 MSQ • 2 Marks

Section 7: Dairy and Food Engineering

Unit Operations in Dairy and Food Engineering

Subtopic: Homogenization

Question Statement:

Which of the following physical phenomena contribute to fat globule size reduction inside a high-pressure homogenization valve?

Options:

  • (A) Intense shear stress in the narrow valve gap
  • (B) Cavitation collapse of vapor bubbles resulting from local static pressure drop below vapor pressure
  • (C) High-velocity liquid jet impact against the impact ring
  • (D) Direct thermal evaporation of the milk triglycerides

Answer Key:

A, B, C

Step-by-Step Solution & Explanation

- A, B, and C are the three established fluid mechanical mechanisms of homogenization: intense velocity shear, explosive cavitation collapse, and physical impact against the ceramic/stellite ring. - D is incorrect: Triglycerides are non-volatile and do not evaporate during homogenization.
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