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Boundary or thin film lubrication occurs when

  • A.the speed is low or the load high, so the film cannot be maintained
  • B.the speed is high and the load light
  • C.the lubricant is a solid powder only
  • D.the surfaces are separated by a thick oil wedge

Answer: A

The oil is squeezed out until only an adsorbed layer a few molecules thick remains, and it is held there by its affinity for the metal rather than by pressure. Oiliness rather than viscosity is the property that matters.

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