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A 3 Phase 400, 100 MVA alternator is connected to infinite bus bar. If the mechanical power input is more than the maximum reluctance power, the reluctance generator will lose synchronizm if ____________

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A 3 Phase 400, 100 MVA alternator is connected to infinite bus bar. If the mechanical power input is more than the maximum reluctance power, the reluctance generator will lose synchronizm if ____________

(a) field is open circuited

(b) field is short-circuited

(c) load is removed

(d) damper is removed

This question was addressed to me in an online quiz.

Question is taken from Measurement of Xd and Xq topic in portion Synchronous Machines of Electrical Machines

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Best answer
Right option is (a) field is open circuited

Explanation: If the excitation itself is made zero, then machine will stop.

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