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← TechnologyWhich outcome occurs when thermal expansion stresses a hydraulic pump?
A)Volumetric efficiency decreases rapidly✓
B)Fluid viscosity increases dramatically
C)Pump casing remains unaffected entirely
D)Cavitation risk reduces noticeably
💡 Explanation
Decreased clearance increases internal leakage via the gap, therefore volumetric efficiency decreases, because the thermal expansion affects tight tolerance components inside the vane or gear pump using **tribological wear** mechanisms, rather than directly altering fluid characteristics.
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