Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  capacitor start induction motor.
  synchronous motor.
  repulsion start induction motor.

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Electrical Machines
With the increase in speed of a DC motor

 back emf increases but line current falls.
 both back emf as well as line current fall.
 back emf falls and line current increases.
 both back emf as well as line current increase.

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

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