Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
  It will be halved.
  It will becomes four times.
 It will remain the same.

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Electrical Machines
With the increase in speed of DC motor

  Back emf increase but line current falls.
 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.

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