Electrical Machines
In an alternator, voltage drops occurs in

  armature resistance, leakage reactance and armature reaction.
  armature resistance and leakage reactance.
  armature resistance, leakage reactance, armature reaction and earth connection.
  armature resistance only.

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Electrical Machines
Armature reaction in a DC machine

 is in direct opposition to the main poles.
 is in the same direction as the main poles.
  makes an angle of 90° with the main pole axis.
 makes an angle with the main pole axis which is load dependent.

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