Allied & ICAR Exam Bank • ALLIED_0708 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Thermal Processing and Kinetics

Subtopic: Thermal Processing and Kinetics

Question Statement:

The thermal resistance constant ($z$-value) is defined as:

Options:

  • (A) The temperature increase in $^\circ\text{C}$ (or $^\circ\text{F}$) required to reduce the $D$-value by a factor of 10 (one log cycle)
  • (B) The time required to kill 12 log cycles
  • (C) The activation energy of enzyme inactivation
  • (D) The pH threshold for spore germination

Answer Key:

A

Step-by-Step Solution & Explanation

$z$-value reflects the thermal sensitivity of the organism: $z = \frac{T_2 - T_1}{\log_{10}(D_1 / D_2)}$.
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