What type of rotor is used in steam-turbine driven alternators (turbo-generators) running at high speeds (3000 RPM)?
AWound slip-ring rotor
BSalient pole rotor
CSmooth cylindrical rotor
DSquirrel cage rotor
Explanation
High-speed turbo-alternators use non-salient (smooth cylindrical) rotors to withstand huge centrifugal forces and reduce windage losses.

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