Question Bank • QB_DFE_UOP_011 MSQ • 2 Marks

Section 7: Dairy and Food Engineering

Unit Operations in Dairy and Food Engineering

Subtopic: Homogenization

Question Statement:

During high-pressure homogenization of liquid milk at $15\text{--}25\text{ MPa}$, fat globules undergo disruption and size reduction through which of the following combined hydrodynamic mechanisms?

Options:

  • (A) Intense elongational and shear stress in the converging homogenizing valve gap
  • (B) Cavitation bubble collapse and shockwaves as pressure drops abruptly below liquid vapor pressure
  • (C) Turbulent micro-eddy inertial collisions and droplet shattering
  • (D) Impact and impingement against the hard wear/breaker ring

Answer Key:

A, B, C, D

Step-by-Step Solution & Explanation

Homogenization valve physics involves high shear (A), cavitation bubble collapse (B), turbulent Kolmogorov eddies (C), and physical impingement on the breaker ring (D). Electromagnetic arcing is fictitious.
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