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Viscosity of a lubricating oil is its resistance to

  • A.oxidation at high temperature
  • B.evaporation at the flash point
  • C.adsorption on a metal surface
  • D.flow under shear

Answer: D

It is the single most important property of an oil for hydrodynamic duty, since it decides the film thickness the bearing can build. Too high a viscosity wastes power in churning and too low a value lets the film collapse.

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