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Which consequence results when a high-viscosity hydraulic fluid is used in a gear pump system operating below its design temperature?

A)Increased internal fluid leakage develops
B)Cavitation erosion risk decreases noticeably
C)Pump volumetric efficiency decreases sharply
D)System pressure response becomes faster now

💡 Explanation

Decreased temperatures increase viscosity, consequently fluid velocities reduce because of increased fluid friction; Sticking prevents proper lubrication, therefore the pump’s volumetric efficiency drops off due to more bypass rather than maintaining displacement volumes.

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