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A dc motor develops the maximum mechanical power when the armature current is such that | |
A. | the back ernf is equal to 3/4th of the applied emf. [Wrong Answer] |
B. | the back emf is equal to one-half of the applied emf. [Correct Answer] |
C. | the back emf is equal to 1/4th of the applied emf. [Wrong Answer] |
D. | the back emf is equal to 2/3rd of the applied emf. [Wrong Answer] |