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Which outcome occurs when volatile liquid refrigerant leaks into a mechanical refrigeration system vacuum pump?

A)Oil dilution reduces lubrication effectiveness
B)Vapor lock prevents rotor movement
C)Thermal runaway destroys windings
D)High pressure ruptures the pump casing

💡 Explanation

Oil dilution occurs because the refrigerant, although in a liquid phase under pressure, vaporizes inside the pump due to vacuum conditions and dissolves into and thins the pump oil, reducing optimal lubrication. Therefore oil dilution results, rather than vapor lock, runaway, or rupture, which involve different mechanisms.

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