Synchronous Motors
A synchronous machine with large air gap has

a higher synchronizing power which makes the machine less sensitive to load variations
a higher value of stability limit
all of the listed here
a small value of inherent regulation

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Synchronous Motors
Synchronous capacitor is

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

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