Que.

a DC motor devolves the maximum mechanical power when the armature current is such that

  • A. the back EMF is equal to three fourth of the applied EMF
  • B. the back EMF is equal to one half of the applied EMF
  • C. the back EMF is equal to one fourth of the Palladium
  • D. the back EMF is equal to two-third of the applied EMF

Right Answer is :
✓ B. the back EMF is equal to one half of the applied EMF
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