21.
In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then

23.
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

24.
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as

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