Answer Posted / s c budhiraja

Syncronous generator runs at syncronous speed of the
system, where as induction generator runs at a speed which
is different from syncronous speed.

As an example if we remome DC excitation from a syncronous
generator and the generator remains connected to the system
AC voltage& the prime mover(turbine etc)Continues running,
the rotor will get excitation induced from the generator
Stator and the generator will continue running as induction
genrator.

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