Synchronous Motors In a 3-phase synchronous motor, the negative phase sequence exists when the motor is over-loaded None of these supplied with unbalanced voltage under-loaded over-loaded None of these supplied with unbalanced voltage under-loaded ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The induced e.m.f. in a synchronous motor working on leading power factor will be equal to the supply voltage less than the supply voltage more than the supply voltage None of these equal to the supply voltage less than the supply voltage more than the supply voltage None of these ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The pull out torque of a synchronous motor will ______ as the field excitation is increased. None of the listed here Decrease Increase Remain unchanged None of the listed here Decrease Increase Remain unchanged 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 over-excitation leading power factor with under-excitation lagging power factor with over-excitation no change of power factor leading power factor with over-excitation leading power factor with under-excitation lagging power factor with over-excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The pull out torque of a practical synchronous motor will occur when the torque angle is about _____ 0° 75° 30° 45° 0° 75° 30° 45° ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When the field of a synchronous motor is under-excited, the power factor will be unity zero lagging leading unity zero lagging leading ANSWER DOWNLOAD EXAMIANS APP
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