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

  locking of rotor due to harmonics.
  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.

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Electrical Machines
In a transformer

 both Oc and SC tests are conducted on HV side
 OC test is conducted on HV side and SC test is conducted on LV side
 OC test is conducted on LV side and SC test is conducted on HV side
 both OC and SC tests are conducted on LV side

ANSWER DOWNLOAD EXAMIANS APP