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The final steady temperature rise of a machine under constant load equals

  • A.its thermal capacity divided by the losses being generated within it
  • B.the ambient temperature added to the rating of its insulation class
  • C.its losses divided by its rate of heat dissipation
  • D.its losses multiplied by its thermal capacity, taken over the running time

Answer: C

At equilibrium the heat generated equals the heat escaping, so the rise is fixed by the losses and by how effectively the machine sheds heat. Neither the thermal capacity nor the running time enters, since both concern the transient only.

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