Allied & ICAR Exam Bank • ALLIED_1335 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Thermal Processing and Kinetics

Subtopic: F-Value Definition

Question Statement:

The standard sterilization lethality value $F_0$ expresses thermal process severity equivalent to time in minutes at:

Options:

  • (A) 121.1 degrees Celsius (250 degrees Fahrenheit) with a z-value of 10 degrees Celsius
  • (B) 100 degrees Celsius with a z-value of 5 degrees Celsius
  • (C) 72 degrees Celsius with a z-value of 15 degrees Celsius
  • (D) 135 degrees Celsius with a z-value of 20 degrees Celsius

Answer Key:

A

Step-by-Step Solution & Explanation

$F_0$ is universally referenced to $121.1^\circ\text{C}$ ($250^\circ\text{F}$) using $z = 10^\circ\text{C}$ ($18^\circ\text{F}$), representing the standard lethality benchmark for spore destruction.
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