Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that

None of these
its speed may be controlled more easily
its speed is independent of supply frequency
its power factor may be varied at will

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Synchronous Motors
Synchronous capacitor is

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

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