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Q67 (CDS-I/2013) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Thermal physics Answer Verified

The gas used in a refrigerator is—

Result
Your answer: —  ·  Correct: D
Explanation

The refrigeration cycle operates on the principle of heat transfer by manipulating the pressure and temperature of a refrigerant. In a standard refrigerator, the refrigerant is compressed into a high-pressure state, which significantly increases its temperature. To achieve cooling, this high-pressure liquid is passed through an expansion valve or metering device. As the refrigerant expands, it experiences a rapid drop in pressure, which causes its temperature to decrease significantly. This process, often associated with the Joule-Thomson effect in gas systems, results in the refrigerant leaving the expansion valve as a cold, low-pressure mixture [1]. This cold refrigerant then enters the evaporator to absorb heat from the refrigerator's interior. Thus, the gas/refrigerant is cooled down specifically when it is expanded, enabling the cooling effect required for food preservation.

Sources

  1. [1] https://www.govinfo.gov/content/pkg/GOVPUB-C13-781fedb85818ca65ccb0438882439d4d/pdf/GOVPUB-C13-781fedb85818ca65ccb0438882439d4d.pdf
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