Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  218.5 volt.
 220.4 volt.
  120 volt.
  None of these.

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Electrical Machines
Cogging of induction motor occurs at

 high voltage and when stator and rotor poles are not equal.
 low voltage and when stator and rotor poles are equal.
 high voltage and when stator and rotor poles are equal.
 low voltage and when stator and rotor poles are not equal.

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