Question 151Refrigeration & AC - 1st Asst/Chief
70% to passConcerning the operation of refrigeration systems, frosting or sweating of a liquid line is usually indicative of what condition?
Aproper cooling taking place
Bhigh relative humidity surrounding the liquid line
Cthe refrigerant contaminated with moisture
Da liquid line restriction
AI Explanation
The correct answer is D) a liquid line restriction. Frosting or sweating of a liquid line is usually indicative of a restriction in the liquid line, which causes the refrigerant to undergo a pressure drop. This pressure drop results in the refrigerant cooling below the dew point, causing condensation or frosting on the liquid line. The other answer choices are incorrect because: A) Proper cooling would not cause frosting or sweating on the liquid line. B) High relative humidity would not directly cause a liquid line restriction. C) Refrigerant contamination with moisture would not necessarily cause a liquid line restriction.
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