Synchronous Motors The direction of rotation of a synchronous motor can be reversed by reversing, Polarity of rotor poles Supply phase sequence Current to field winding None of the listed here Polarity of rotor poles Supply phase sequence Current to field winding 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 under-excitation no change of power factor leading power factor with over-excitation lagging power factor with over-excitation leading power factor with under-excitation no change of power factor leading power factor with over-excitation lagging power factor with over-excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The speed of a synchronous motor Always remains constant Increases as the load increases Decreases as the load decreases None of the listed here Always remains constant Increases as the load increases Decreases as the load decreases None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The capacity of a synchronous capacitor is generally in the range of VAR MVAR kVAR None of the listed here VAR MVAR kVAR None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is less equal twice more less equal twice more ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor, the rotor copper loss are met by ______ Motor input Armature input Dc source Supply lines Motor input Armature input Dc source Supply lines ANSWER DOWNLOAD EXAMIANS APP
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