Electrical Machines
With the increase in speed of DC motor

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

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Electrical Machines
A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current

 Would be equal to If1.
 Woud be equal to 2If1.
  Cannot be predicted due to insufficient data.
 Would be equal to If1/2.

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