Which consequence results when backflow contaminates a refrigeration system's refrigerant?

💡 Explanation

Compressor oil foaming results from refrigerant contamination via reverse flow because acid formation creates sludge which lowers oil viscosity leading foaming; therefore foaming occurs, rather than subcooling changes or pressure drops which require refrigerant property shifts.

• Which risk significantly increases if a bipolar junction transistor's (BJT) base current exceeds design limits from parasitic capacitance during rapid switching?
• Which operational hazard increases when harmonic currents flow within three-phase power transformers due to non-linear loads?
• Which mechanism leads to carrier avalanche in reverse-biased semiconductor junctions?
• Which consequence results when PLC cycle time exceeds scan duration in robotic cell?
• Which mechanical issue is accelerated when a diesel engine crankshaft experiences torsional resonance at elevated RPM?
• Which outcome is most probable when a three-phase power transformer system experiences sustained unbalanced loading?