Allied & ICAR Exam Bank • ALLIED_1341 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Thermal Processing and Kinetics

Subtopic: Sterilization Lethality Integration

Question Statement:

A batch retorting thermal process has a heating phase delivering $F_0 = 1.2\text{ min}$, a steady holding phase delivering $F_0 = 4.0\text{ min}$, and a cooling phase delivering $F_0 = 0.8\text{ min}$. The total process lethality $F_0$ (in minutes) is:

Answer Key:

6.0

Step-by-Step Solution & Explanation

$F_{0,total} = F_{0,heating} + F_{0,holding} + F_{0,cooling} = 1.2 + 4.0 + 0.8 = 6.0\text{ minutes}$.
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