Question 74Refrigeration & AC - QMED
70% to passExcessive, prolonged oil foaming in the crankcase of a refrigeration compressor can result in what condition?
Awax crystals forming in the thermal expansion valve
Bexcessively high lube oil viscosity
Ccarbon deposits on the compressor piston rings
Doverheated compressor bearings
AI Explanation
The correct answer is D) overheated compressor bearings. Excessive, prolonged oil foaming in the crankcase of a refrigeration compressor can lead to overheated compressor bearings. This is because the foaming of the lubricating oil reduces its ability to effectively lubricate and cool the compressor bearings, causing them to overheat. The other answer choices, such as wax crystals in the expansion valve (A), high lube oil viscosity (B), or carbon deposits on the piston rings (C), are not directly related to the issue of excessive oil foaming in the crankcase.
Related Questions
Q146:What is the physical state and pressure condition of refrigerant as it leaves a ... Q58:In refrigeration systems with multiple evaporators, the metering of refrigerant ... Q133:When opening or closing compressor service and line isolation valves on a typica... Q3:If it is necessary to increase the operating head pressure of the refrigeration ... Q73:One cause of high head pressure occurring in a refrigeration system can be which...
Ready to test your knowledge?
Take a Refrigeration & AC - QMED Practice ExamOfficial Resources