113. How is the main propeller shaft rotation of a conventional AC turbo-electric drive normally reversed? (Assume that no converters or inverters are used.)

Reversing the phase sequence applied to the AC propulsion motor reverses the rotating magnetic field, thereby reversing the propeller shaft rotation. This method is used in conventional turbo-electric drives without converters or inverters, as the turbine and generator operate continuously in a single direction and field polarity reversal is a characteristic of DC motors, not AC motors.