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

Last 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 :

Last Answer : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to : Z (p.u)

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

Last Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only

Last Answer : The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.

Last Answer : Synchronsizing power of a synchronous machine is inversely proportional to the synchronous reactance.