Electrical Machines
The direction of rotation of a DC motor can be determined by

 Lenz's law.
 Ampere's law.
  Fleming's left hand rule.
 Fleming's right hand rule.

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

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Electrical Machines
The armature mmf of a DC machine has

  triangular space distribution and is stationary in space.
  trapezoidal space distribution and is stationary in space.
 stepped distribution and rotates at the speed of armature.
  triangular space distribution and rotates at the speed of armature.

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