Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

 Connecting an additional resistance in the armature circuit.
 Connecting an additional resistance in the field circuit.
 Any of the above.
 Connecting an additional resistance in stator circuit.

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Electrical Machines
In a stepper motor the detente torque means

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

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