If armature current in a generating synchronous machine

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If armature current in a generating synchronous machine is in phase with the excitation emf, then armature mmf vector

1. lags behind the field mmf vector by 90°.
2. is in the same direction as the field mmf vector.
3. is in a direction opposite to the field mmf vector.
4. leads the field mmf vector by 90° as observed from the startor

Correct Option: A

NA