Discussion
Excitation of a modern large synchronous machine is usually provided by
Answer: C
Correct answer: a brushless exciter on the same shaft
A modern large machine uses a shaft-mounted exciter whose armature is on the rotor, feeding a rotating rectifier that supplies the main field winding directly - so no slip rings or brushes are needed for the field current. This removes the brush wear, carbon dust and inspection that a slip ring arrangement demands, which matters greatly on a machine expected to run continuously for years.
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