The duration of sudden short-circuit test on a synchronous motor is usually about one second.
Answer : A synchronous machine with low value of short-circuit ratio has lower stability limit.
Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.
Answer : In case one phase of a three-phase synchronous motor is short-circuited the motor will not start.
Answer : If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero.
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.