Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________

0° electrical
90° electrical
30° electrical
45° electrical

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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
lagging power factor with over-excitation
leading power factor with over-excitation
no change of power factor

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