Discussion
At zero power factor leading load, the armature reaction in alternator is:
Answer: B
At zero power factor leading, the armature reaction in an alternator is purely magnetising. When the armature current leads the voltage by 90°, its flux acts in the same direction as the main field, and so it assists the field and raises the terminal voltage.
At zero power factor lagging the reaction is purely demagnetising, at unity power factor it is cross-magnetising, and for intermediate power factors it is part cross and part demagnetising or magnetising. So the second option is correct.
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