Synchronous Motors The rotor copper losses, in a synchronous motor, are met by motor input c. source supply lines armature input motor input c. source supply lines armature input ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The duration of sudden short circuit test on synchronous motor is usually about One hour None of the listed here One minute One second One hour None of the listed here One minute One second ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The efficiency of a properly designed synchronous motor will usually fall in range 75 to 80% 60 to 70% 99 to 99.5% 85 to 95% 75 to 80% 60 to 70% 99 to 99.5% 85 to 95% ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When a synchronous motor is pulled out of synchronism, the stator current ________ Remains unchanged Is decreased too much Become zero Is increased too much Remains unchanged Is decreased too much Become zero Is increased too much ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The speed of a synchronous motor can be changed by varying _______ None of the listed here Field excitation Mechanical load Supply frequency None of the listed here Field excitation Mechanical load Supply frequency ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When the synchronous motor runs at synchronous speed, the voltage induced in the damper winding is _____ Zero Maximum None of the listed here minimum Zero Maximum None of the listed here minimum ANSWER DOWNLOAD EXAMIANS APP