Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Decrease in speed demanding less armature current.
  Increase in speed but armature currnet remains the same.
  Decrease in speed but armature current remains the same.
  Increase in speed demanding more armature current.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Cogging of induction motor occurs at

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

ANSWER DOWNLOAD EXAMIANS APP