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Which mechanism diminishes hydraulic pump performance at high temperature?

A)Viscosity reduction causes internal leakage
B)Fluid density induces cavitation erosion
C)Increased surface tension enhances sealing
D)Thermal expansion overcomes tight tolerances

💡 Explanation

A temperature increase reduces the oil's viscosity. Because decreased viscosity reduces resistance to flow across the pump's internal clearances; therefore, leakage bypasses pumping chambers, rather than achieving intended pressure output, rather than higher system work.

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