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← TechnologyWhich outcome occurs when lubricating oil viscosity is too low in a positive displacement pump?
A)Increased pump cavitation and erosion
B)Reduced volumetric efficiency and slippage✓
C)Elevated pump discharge pressures and forces
D)Decreased pump startup torque and efficiency
💡 Explanation
When oil viscosity is too low, increased fluid leakage (slippage) occurs within the pump because viscous shear resistance decreases, leading to lower volumetric efficiency. Therefore reduced volumetric efficiency results, rather than cavitation, elevated pressure, or decreased startup, which depend on different factors.
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