Synchronous Motors The rotor of synchronous motor is excited with direct current when the motor _____ Approches half synchronous speed Approches synchronous speed Is at standstill None of the listed here Approches half synchronous speed Approches synchronous speed Is at standstill None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor runs at only one speed because it ______ Has no losses Is a doubly fed machine Has a damper winding None of the listed here Has no losses Is a doubly fed machine Has a damper winding None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor, the magnitude of stator back emf depends on _____ Both the speed and rotor flux Load on the motor Dc excitation only Speed of the rotor Both the speed and rotor flux Load on the motor Dc excitation only Speed of the rotor 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 no change of power factor leading power factor with under-excitation leading power factor with over-excitation lagging power factor with over-excitation no change of power factor leading power factor with under-excitation leading power factor with over-excitation lagging power factor with over-excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In order to to reverse the direction of a synchronous motor, _______ Interchange any two stator lines Change supply frequency None of the listed here Reduce dc field excitation to zero Interchange any two stator lines Change supply frequency None of the listed here Reduce dc field excitation to zero ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Most of the synchronous motors are _______ power factor metors. Unity 0.5 leading 0.8 lagging 0.8 leading Unity 0.5 leading 0.8 lagging 0.8 leading ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS