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A synchronous machine with low value of short-circuit ratio has lower stability limit.

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Answer : The duration of sudden short-circuit test on a synchronous motor is usually about one second.

Description : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to :

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Description : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)  (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents

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