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

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

 increases in both the generators and the motors with load.
 decreases in generators and increases in motor with load.
  decreases in both generators and the motors with load.
 increases in generators but decreases in motor with load.

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