Electrical Machines
In a DC machine

 current and emf in armature are alternating.
 current and emf at the terminals are alternating.
 emf in armature conductors and at the terminals is alternating.
 current and emf in armature are unidirectional

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

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

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Electrical Machines
Two generators operating in parallel with rating 50MW and 100MW respectively. Both their respective governor settings are identical as 4%, consider same no load frequency. How will the machine share a common load of 100 MW

 33.33 MW and 66.67 MW respectively
 50 MW and 50 MW respectively
 66.67 MW and 33.33 MW respectively
 any of the above

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