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

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  worsen and terminal voltage will fall
  worsen and terminal voltage will rise.
 improve but terminal voltage will fall.
  improve and terminal voltage will rise .

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