Electrical Machines
The working principle of transformer depends on

 Coulombs law.
 Amperes law.
 Newtons law.
 Faradays law of electromagnetic induction.

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Electrical Machines
In an alternator, voltage drops occurs in

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

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