Synchronous Motors A synchronous motor can be made self starting by providing Damper winding on stator None of the listed here Damper winding on rotor poles Damper winding on stator as well as rotor poles Damper winding on stator None of the listed here Damper winding on rotor poles Damper winding on stator as well as rotor poles ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The duration of sudden short-circuit test on a synchronous motor is usually about None of these one second one hour one minute None of these one second one hour one minute ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The induced e.m.f. in a synchronous motor working on leading power factor will be None of these less than the supply voltage equal to the supply voltage more than the supply voltage None of these less than the supply voltage equal to the supply voltage more than the supply voltage ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When a synchronous motor is pulled out of synchronism, the stator current ________ Become zero Remains unchanged Is decreased too much Is increased too much Become zero Remains unchanged Is decreased too much Is increased too much ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The net armature voltage of a synchronous motor is equal to the arithmetic difference of Eb and V vector sum of Eb and V arithmetic sum of Eb and V vector difference of Eh and V arithmetic difference of Eb and V vector sum of Eb and V arithmetic sum of Eb and V vector difference of Eh and V 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 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 leading power factor with over-excitation leading power factor with under-excitation ANSWER DOWNLOAD EXAMIANS APP
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