Q.The mechanical power developed by a dc motor maximum is maximum when 

  • ABack emf is equal to applied voltage
  • BBack emf is equal to zero
  • CBack emf is equal to half the applied voltage
  • DNone of the above 
Correct Answer : (C)

Back emf is equal to half the applied voltage

Hints :

The mechanical power developed by a dc motor maximum is maximum when Back emf is equal to half the applied voltage.

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