Electrical Machines
The reduced air gap results in an increase

  power factor.
  starting torque.
  breaking torque.
  cost of operation.

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Electrical Machines
The armature mmf of a DC machine has

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

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