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The viscosity of a lubricating oil with rising temperature

  • A.falls
  • B.rises
  • C.remains constant
  • D.first falls and then rises again

Answer: A

Thermal agitation loosens the molecules' hold on one another, so an oil thin enough to circulate when cold may be too thin to carry the load when hot. Reconciling the two is the whole problem that multigrade oils address.

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