what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?
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When excitation of an unloaded salient pole synchronous motor suddenly gets disconnected the motor will stop.
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Answer : If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.

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

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

Description : If we change the excitation of synchronous machine will it affect on motor speed?

Answer : No, If we change the excitation of synchronous machine it will not affect on motor speed.

Answer : A synchronous motor running with normal excitation adjusts to load increases essentially by increase in armature current.

Description : The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

Answer : The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor