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Which outcome results in a refrigeration compressor when superheated discharge causes excessive thermal load?

A)Increased refrigerant subcooling occurs rapidly
B)Decreased thermal expansion valve efficiency
C)Lubricant breakdown and bearing failure
D)Evaporator coil forms excessive ice

💡 Explanation

Lubricant breakdwon occurs by oxidation because excessively high temperatures degrade the oil's viscosity by thermocracking causing it to lose lubricating properties; therefore bearing failures form, rather than expansion valve efficiency which occurs in different refrigeration conditions.

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