Electrical Machines
With the increase in speed of DC motor

  Back emf increase but line current falls.
 Both back emf as well as line current increase.
 Back emf falls and line current increase.
 Both back emf as well as line current fall.

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Electrical Machines
The armature mmf of a DC machine has

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

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