Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

All of these
 4 point starter
 2 point starter
 3 point starter

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Electrical Machines
The mmf produced by rotor currents of a 3 - Φ induction motor

  rotates at slip speed with respect to stator mmf.
  rotates at the speed of rotor in the air gap.
  rotates at synchronous speed with respect to rotor.
  is at standstill with respect to stator mmf.

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Electrical Machines
In a stepper motor the detente torque means

  minimum of the static torque with the phase winding unexcited.
  maximum of the static torque with the phase winding excited.
  minimum of the static torque with the phase winding excited.
  maximum of the static torque with the phase winding unexcited.

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