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← ScienceIn a refrigeration system employing R-134a, which consequence results when the compressor discharge overheats due to low evaporator pressure?
A)Oil viscosity significantly decreases✓
B)Superheat remains unchanged largely
C)Subcooling decreases, increasing capacity
D)Volumetric efficiency shows marginal increase
💡 Explanation
Extreme superheat will cause oil thinning. Because the oil's viscosity decreases due to exceeding its temperature limit, it cannot properly lubricate, therefore increased wear occurs rather than unaffected superheat or increased system capacity by decreased subcooling.
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