Allied & ICAR Exam Bank • ALLIED_1309 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Dairy Unit Operations

Subtopic: Milk Homogenization

Question Statement:

High-pressure homogenization of fluid milk (typically at 15 to 25 MPa) disrupts fat globules primarily to:

Options:

  • (A) Reduce average fat globule diameter to below 2 microns to prevent gravity creaming
  • (B) Separate cream from skim milk
  • (C) Sterilize milk without heat
  • (D) Precipitate casein into curds

Answer Key:

A

Step-by-Step Solution & Explanation

Forcing hot milk through an microscopic annular valve slit subjects fat globules to intense shear, cavitation, and turbulence, shattering globules from $4-10\;\mu\text{m}$ to
lt;2\;\mu\text{m}$, creating a permanent emulsion.
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