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For obtaining maximum current when we conduct the ‘Slip Test’ on a synchronous machine, its armature field will align along __________

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For obtaining maximum current when we conduct the ‘Slip Test’ on a synchronous machine, its armature field will align along __________

(a) d-axis

(b) q-axis

(c) 45° to d-axis

(d) 45° to q-axis

I had been asked this question in an interview for job.

This intriguing question comes from Two Reaction Theory of Salient Pole Machines topic in chapter Synchronous Machines of Electrical Machines

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Right answer is (b) q-axis

To explain I would say: The maximum current is observed at low reluctance which is along q-axis.

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