Electrical Machines
Air core transformer as compared to iron core transformer, has

  no magnetic core loss.
 more magnetic core loss.
  more copper loss.
 less magnetic core loss.

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Electrical Machines
In an alternator, voltage drops occurs in

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

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