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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 percentage impedance of all transformers must be same.
  polarities of all transformers must be same.
 MVA rating of all transformer inversely proportional to impedance.
 voltage ratio of all transformers must be same.

ANSWER DOWNLOAD EXAMIANS APP