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A 3 phase 400V cylindrical rotor is running at 1500rpm. Suddenly the field excitation zero. Then the net reluctance power is?

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A 3 phase 400V cylindrical rotor is running at 1500rpm. Suddenly the field excitation zero. Then the net reluctance power is?

(a) 0

(b) sin 2d

(c) cos d

(d) cos 2d

I got this question in class test.

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

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The correct answer is (a) 0

For explanation I would say: The net reluctance power for a cylindrical rotor type alternator will be zero if the field excitation is made zero.

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