Question 120Refrigeration & AC - QMED

The correct answer is D) all of the above. An unusual noise coming from a refrigeration compressor can be caused by several conditions, including: A) Worn bearings and piston pins - This can lead to increased friction and vibration, resulting in unusual noises. B) Slugging due to flooding back - This occurs when liquid refrigerant enters the compressor, causing a hydraulic shock and unusual noises. C) Too much oil in circulation - Excess oil can interfere with proper lubrication, leading to increased wear and noises. All of these conditions can contribute to unusual noises from a refrigeration compressor, making D) all of the above the correct answer.