Question Bank • QB_DFE_UOP_014 MSQ • 2 Marks

Section 7: Dairy and Food Engineering

Unit Operations in Dairy and Food Engineering

Subtopic: Pasteurization

Question Statement:

Which of the following thermal combinations represent internationally recognized statutory minimum standards for milk pasteurization targeting \textit{Coxiella burnetii}?

Options:

  • (A) Low-Temperature Long-Time (LTLT / Vat): $62.8^\circ\text{C}$ ($145^\circ\text{F}$) for not less than $30\text{ minutes}$
  • (B) High-Temperature Short-Time (HTST): $71.7^\circ\text{C}$ ($161^\circ\text{F}$) for not less than $15\text{ seconds}$
  • (C) Higher Heat Shorter Time (HHST): $88.3^\circ\text{C}$ ($191^\circ\text{F}$) for not less than $1.0\text{ second}$
  • (D) Ultra-High Temperature (UHT): $60.0^\circ\text{C}$ for $5\text{ seconds}$

Answer Key:

A, B, C

Step-by-Step Solution & Explanation

Statutory milk pasteurization standards established to eliminate \textit{Coxiella burnetii} (the most heat-tolerant non-spore-forming pathogen in raw milk) are $62.8^\circ\text{C}/30\text{ min}$ (LTLT), $71.7^\circ\text{C}/15\text{ s}$ (HTST), and $88.3^\circ\text{C}/1.0\text{ s}$ (HHST). Option D is incorrect; UHT requires $135-150^\circ\text{C}$ for $2-5\text{ s}$.
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