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

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

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Synchronous Motors
Synchronous capacitor is

None of the listed here
An ordinary static capacitor bank
An over excited synchronous motor driving mechanical load
An over excited synchronous motor running without mechanical load

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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

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

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