Electrical Machines
In a DC machine

 current and emf in armature are unidirectional
 current and emf in armature are alternating.
 current and emf at the terminals are alternating.
 emf in armature conductors and at the terminals is alternating.

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

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