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 outcome occurs when high-frequency harmonics circulate within a power transformer core?
• Which risk increases when thermal expansion coefficients mismatch in heat exchanger?
• Which outcome occurs when one phase is lost in a three-phase induction motor driving a high-inertia load?
• Which consequence results when a PLC in a robotic milling cell experiences unintended program modification?
• Which consequence results when thermal expansion misaligns a CNC milling machine's ball screw actuator?
• Which outcome occurs when a pulsed laser rangefinder's photodiode receives scattered, rather than directly reflected light?