Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Open fuse or circuit breaker.
 Produce sparking at brushes.
 Draw too much current.
  Develop excessive speed and damage itself.

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Electrical Machines
In a 3 - Φ induction motor

  power factor at starting in the same as that while running.
  none of them.
  power factor at starting is high as compared to that while running.
  power factor at starting is low as compared to that while running.

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Electrical Machines
The synchronous motor can be started by

  coupling it with a small AC induction motor called the pony motor.
  any of the above methods.
  providing damper winding in its rotor circuit.
  coupling it with a DC compound motor.

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