The armature core of a dc machine gets overheated due to 

  • ACopper loss occurring in armature windings only
  • BEddy current loss only
  • CHysteresis loss only
  • DAll of the above
Correct Answer : (D)

All of the above

Hints :

The current drawn by a 120 V dc motor with back emf of 110 V and armature resistance of 0.4 ohm is


With the increase in speed of a dc motor

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