Question 161Refrigeration & AC - Assistant Engineer
70% to passConcerning the operation of refrigeration systems, frosting or sweating of a liquid line is usually indicative of what condition?
Ahigh relative humidity surrounding the liquid line
Ba liquid line restriction
Cthe refrigerant contaminated with moisture
Dproper cooling taking place
AI Explanation
The correct answer is B) a liquid line restriction. Frosting or sweating of a liquid line is usually indicative of a restriction in the liquid line, which causes a pressure drop and reduces the temperature of the refrigerant. This results in the refrigerant temperature dropping below the dew point, causing condensation or frosting on the liquid line. The other options are incorrect because: A) high relative humidity would not directly cause frosting or sweating on the liquid line, C) refrigerant contaminated with moisture would cause issues throughout the system, not just on the liquid line, and D) proper cooling would not result in frosting or sweating on the liquid line.
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