Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards brush axis.
 Peaky in nature.
 Triangular and directed towards main pole.
 Saddle shape.

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Electrical Machines
With the increase in speed of DC motor

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

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