GATE AG 2010 • Q23 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Preservation of Food

Subtopic: Kinetics of microbial death – pasteurization and sterilization of milk and other liquid foods

Question Statement:

Let m, n and p be the numbers of carbon, hydrogen and fluorine atoms in a refrigerant. The identification number of the refrigerant is

Options:

  • (A) R
  • (B) R
  • (C) R
  • (D) R

Official Answer Key:

B

Step-by-Step Solution & Explanation

By the standard ASHRAE halocarbon numbering rule, the refrigerant number's digits (from left) are (number of carbon atoms − 1), (number of hydrogen atoms + 1), (number of fluorine atoms): R = 100(m−1) + 10(n+1) + p, i.e. R(m−1)(n+1)p.

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