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The heating of a motor is usually modelled by treating the machine as

  • A.a body whose temperature is uniform and unchanging under all conditions
  • B.a perfect insulator that loses no heat to its surroundings at all
  • C.a homogeneous body with a single temperature
  • D.a set of independent parts each at its own separate temperature

Answer: C

One lumped thermal capacity losing heat in proportion to its temperature rise gives a first-order equation that fits measured behaviour well enough for rating. The real machine has hot spots, which is why measured rises are compared against class limits with margin.

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