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A dc generator's rating is limited primarily by

  • A.the speed at which the prime mover can drive it
  • B.the number of commutator segments it carries
  • C.the temperature rise of its windings and commutator
  • D.the flux per pole that the field can produce

Answer: C

Copper and iron losses heat the machine, and the insulation and the commutator surface set the limit on how hot it may get. Commutation quality can bite first on a machine of large current, which is why very large dc machines are rare.

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