Electrical Machines
Armature of DC machine is made of

 non-ferrous material.
 insulating material.
 conducting material.
 silicon steel.

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Electrical Machines
In a stepper motor the detente torque means

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

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