Synchronous Motors Synchronous motors are generally used in application requiring _______ Infrequent starting Variable speed Frequent stopping Sudden application of heavy loads Infrequent starting Variable speed Frequent stopping Sudden application of heavy loads 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% 85 to 95% 99 to 99.5% 75 to 80% 60 to 70% 85 to 95% 99 to 99.5% ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors If a synchronous motor is operating at a supply frequency of 50 cycles/second, then, rotor revolves at ______ 100 cycles/second 25 cycles/ second None of the listed here 50 cycles/second 100 cycles/second 25 cycles/ second None of the listed here 50 cycles/second ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When a synchronous motor is on no load, the torque angle is about ________ 90° electrical 0° electrical 30° electrical 45° electrical 90° electrical 0° electrical 30° electrical 45° electrical ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor, the magnitude of stator back emf depends on _____ Both the speed and rotor flux Dc excitation only Load on the motor Speed of the rotor Both the speed and rotor flux Dc excitation only Load on the motor Speed of the rotor ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The speed of a synchronous motor Increases as the load increases Always remains constant Decreases as the load decreases None of the listed here Increases as the load increases Always remains constant Decreases as the load decreases None of the listed here ANSWER DOWNLOAD EXAMIANS APP
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