Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the source frequency.
 increase the number of turns in field coil.
 increase the number of turns in armature coil.
  increase the speed of shaft rotation.

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Electrical Machines
In an alternator, voltage drops occurs in

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

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