Electrical Machines Alternator and Synchronous Motors

If an alternator is operating at unity power factor, then its terminal voltage is:

1
equal to the induced EMF, with zero voltage regulation
2
greater than the induced EMF, with negative voltage regulation
3
less than the induced EMF, with positive voltage regulation
4
less than the induced EMF, with negative voltage regulation
5
greater than the induced EMF, with positive voltage regulation

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