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← TechnologyWhich problem emerges when overheating a vapor-compression refrigeration unit near vacuum?
A)Refrigerant oil viscosity elevates rapidly
B)Compressor motor windings face insulation breakdown✓
C)Expansion valve constricts from thermal expansion
D)Evaporator surfaces experience hastened corrosion
💡 Explanation
Motor insulation fails because increased temperature degrades polymer integrity via Thermal runaway. Thermal changes result in high current and dielectric breakdown, rather than mere viscosity increases or other effects. Therefore insulation weakening is the answer.
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