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A salient pole synchronous generator has following per-unit parameter Xd = 1.2 pu, Xq = 0.8pu, ra = 0.25 ohms. Then the armature current at 0.8 lagging is?

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A salient pole synchronous generator has following per-unit parameter Xd = 1.2 pu, Xq = 0.8pu, ra = 0.25 ohms. Then the armature current at 0.8 lagging is?

(a) 1,-36.9°

(b) 1, 36.9°

(c) 1, 73°

(d) 1, 27°

I have been asked this question in final exam.

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

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Right answer is (a) 1,-36.9°

For explanation: In per unit, armature current will be lagging by 36.9°.

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