Which of the following is not a common refrigerant ?
Correct answer: B. Ethylene
- A. Freon-12
- B. Ethylene
- C. Ammonia
- D. Carbon dioxide
Explanation
Freon-12, ammonia, and carbon dioxide are established common refrigerants. Ethylene can be used in specialized low-temperature systems, but it is not generally listed among common refrigerants in basic engineering questions.
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