Question 17Refrigeration & AC - Assistant Engineer

The correct answer is C) freeze in the expansion valve. When moisture enters a refrigeration system, it can freeze in the expansion valve, which is a critical component responsible for controlling the flow of refrigerant and maintaining the proper pressure differential between the high-pressure and low-pressure sides of the system. The expansion valve is designed to regulate the flow of refrigerant, and when moisture is present, it can freeze and block the valve, disrupting the proper operation of the refrigeration system. The other options are incorrect because: A) sweating and frost on the evaporator coils is a symptom of the moisture freezing in the expansion valve, not the direct cause; B) the moisture would not boil in the condenser, as the condenser operates at a higher pressure and temperature; and D) the liquid line strainers are designed to remove debris, not necessarily moisture, from the system.