Electrical Machines
In DC generator, armature reaction refers to what?

  Effect of armature flux on the main field flux.
 Effect of armature flux on the load.
None of these
 Effect of field flux on the armature flux.

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

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

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