Synchronous Motors A three phase synchronous motor will have Three slip rings One slip rings Two slip rings No slip rings Three slip rings One slip rings Two slip rings No slip rings ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______ Mid way between N and S poles of stator 45° (electrical) behind stator poles Coincident with statorbpoles None of the listed here Mid way between N and S poles of stator 45° (electrical) behind stator poles Coincident with statorbpoles None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have leading power factor with over-excitation leading power factor with under-excitation no change of power factor lagging power factor with over-excitation leading power factor with over-excitation leading power factor with under-excitation no change of power factor lagging power factor with over-excitation 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 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 ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The rotor of synchronous motor is excited with direct current when the motor _____ Approches synchronous speed None of the listed here Is at standstill Approches half synchronous speed Approches synchronous speed None of the listed here Is at standstill Approches half synchronous speed ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous capacitor is an over excited motor running at ________ Half full load None of the listed here No load Full load Half full load None of the listed here No load Full load ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS