The efficiency of a dc machine can be determined without directly loading it with

  • AMachine rating 
  • BArmature and field resistance 
  • CNo load input of het machine
  • DAll of the above information 
Correct Answer : (D)

All of the above information 

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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