Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature resistance control.
 Any of above.
 Armature voltage control.
 Shunt field resistance control.

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Electrical Machines
In a stepper motor the detente torque means

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

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