Synchronous Motors
A synchronous motor is cheaper than 3-phase induction motor for _____

High speed, high output
Low speed, high output
High speed, low output
None of the listed here

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

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