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A 3 phase 400V salient pole alternator is running at no-load. Suddenly the excitation is removed then the net power in the machine is proportional to _____________

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A 3 phase 400V salient pole alternator is running at no-load. Suddenly the excitation is removed then the net power in the machine is proportional to _____________

(a) sin 2d

(b) sin d

(c) cos 2d

(d) 0

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I'm obligated to ask this question of Power Angle Characteristics of Synchronous Machines topic in division Synchronous Machines of Electrical Machines

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The correct option is (a) sin 2d

Easiest explanation: The reluctance power generated will be proportional to sin(2δ).

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