Synchronous Motors
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then

the back e.m.f. will be more than the supply voltage
the stator current will be zero
the stator current will be very high
the stator current will be very small

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Synchronous Motors
Synchronous capacitor is

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

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