Electrical Machines
Which type of motors uses slip rings?

 Synchronous motors
 Both Synchronous and Induction motor
 DC Shunt Motor
 Induction motors

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Electrical Machines
In case of 3 - Φ IM, plugging means

  pulling the motor directly on line without a rotor.
  interchanging two supply phases for quick stopping.
  locking of rotor due to harmonics.
  starting the motor on load which is more than the rated load.

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