Synchronous Motors For power factor correction, synchronous motors operate at normal load with minimum excitation no-load and under-excited fields normal load with zero excitation no-load and greatly over-excited fields normal load with minimum excitation no-load and under-excited fields normal load with zero excitation no-load and greatly over-excited fields ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______ None of the listed here 45° (electrical) behind stator poles Mid way between N and S poles of stator Coincident with statorbpoles None of the listed here 45° (electrical) behind stator poles Mid way between N and S poles of stator Coincident with statorbpoles ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then it continues to run at the same speed the motor stops it runs at a very high speed it runs at a slower speed it continues to run at the same speed the motor stops it runs at a very high speed it runs at a slower speed ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The duration of sudden short circuit test on synchronous motor is usually about One minute None of the listed here One hour One second One minute None of the listed here One hour One second ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors If a synchronous motor is operating at a supply frequency of 50 cycles/second, then, rotor revolves at ______ 50 cycles/second 25 cycles/ second None of the listed here 100 cycles/second 50 cycles/second 25 cycles/ second None of the listed here 100 cycles/second ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The maximum speed variation in a 3 phase synchronous motor is 4 percent 10 percent Zero 2 percent 4 percent 10 percent Zero 2 percent ANSWER DOWNLOAD EXAMIANS APP
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