Discussion
A turbo-alternator driven by a steam turbine has
Answer: A
Correct answer: a cylindrical rotor with two or four poles
A steam turbine runs fast, so the alternator must have few poles - two for 3,000 rpm on a 50 Hz system, four for 1,500. At those speeds the rotor must be a long slender cylinder of forged steel with the field winding buried in slots, because a salient pole structure could not survive the centrifugal stress.
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