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The primary function of a lubricant is to

  • A.reduce friction between moving surfaces
  • B.increase the load a bearing can carry
  • C.raise the operating temperature of the machine
  • D.seal the bearing against the entry of air

Answer: A

Correct answer: reduce friction between moving surfaces

Reducing friction is the primary function, and everything else follows from it: less friction means less heat generated and less wear, and the film that separates the surfaces also carries away heat and excludes contaminants. Those are consequences of interposing the film, not separate purposes for which a lubricant is chosen.

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