Electrical Machines
In an alternator, voltage drops occurs in

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

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Electrical Machines
Armature reaction in a DC machine

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

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