Question 3Electricity & Electronics - 1st Asst/Chief

The correct answer is A) AC synchronous motors. In a twin screw diesel-electric AC propulsion system, AC synchronous motors are typically used. Synchronous motors operate by synchronizing the rotating magnetic field produced by the stator windings with the rotor's magnetic field, resulting in a constant speed regardless of load. This makes them well-suited for propulsion applications where a consistent speed is desired. The other options are incorrect because: B) AC squirrel cage induction motors are not commonly used in diesel-electric propulsion systems, C) AC wound rotor induction motors are not the typical choice for this application, and D) AC/DC universal motors are not the primary motors used in this type of propulsion system.