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Which outcome occurs when lubricating oil in a hydraulic system experiences increased shear rate?

A)Viscosity decreases via shear thinning
B)Fluid elasticity reaches critical limit
C)Thermal expansion saturates entirely stably
D)Bulk modulus shifts toward incompressibility

💡 Explanation

Viscosity decreases sharply because shear thinning is occurring, a non-Newtonian behaviour where increased shear reduces the fluid's resistance to flow. Consequently, the oil performs more poorly, rather than showing elasticity because thermal expansion and bulk modulus are secondary effects.

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