Synchronous Motors The speed of a synchronous motor can be changed by varying _______ None of the listed here Mechanical load Supply frequency Field excitation None of the listed here Mechanical load Supply frequency Field excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When the synchronous motor is pulled out of synchronism, the stator current _______ Becomes zero Remains unchanged Is increased too much Is decreased too much Becomes zero Remains unchanged Is increased too much Is decreased too much ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Mostly, synchronous motors are of Induction type machines Smooth cylindrical type machines Salient pole type machines Alternator type machines Induction type machines Smooth cylindrical type machines Salient pole type machines Alternator type machines ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______ Coincident with statorbpoles Mid way between N and S poles of stator 45° (electrical) behind stator poles None of the listed here Coincident with statorbpoles Mid way between N and S poles of stator 45° (electrical) behind stator poles None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The efficiency of a properly designed synchronous motor will usually fall in range 75 to 80% 85 to 95% 99 to 99.5% 60 to 70% 75 to 80% 85 to 95% 99 to 99.5% 60 to 70% 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 50 cycles/second None of the listed here 100 cycles/second 25 cycles/ second 50 cycles/second None of the listed here ANSWER DOWNLOAD EXAMIANS APP
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