Electrical Machines
In synchronous generator, inverted V curve is drawn between

 field current on X-axis and power factor on Y-axis
 field current on Y-axis and power factor on X-axis
 field current on Y-axis and armature current on X-axis
 field current on X-axis and armature current on Y-axis

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

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