Question 3Electricity/Electronics - 1st Asst/Chief70% to pass
In the twin screw diesel-electric AC propulsion system shown in the illustration, what type of propulsion motors is used? Illustration EL-0164
AI Explanation
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.
Related Questions
#1 As shown in the illustrated electric propulsion control scheme for a twin screw vessel, when the two shaft speeds are within 5% of each other, the bridge may select "shaft synchro- phasing mode". What statement is true regarding the purpose of this operating mode? Illustration EL-0168 #2 Referring to the illustration of a twin-screw diesel-electric AC propulsion drive system, concerning the various control pulse signals, what statement is true? Illustration EL-0168 #4 Referring to the illustration of a twin-screw diesel-electric AC propulsion drive system, if either the port propulsion excitation transformer or the port propulsion field controller was inoperable, what statement is true? Illustration EL-0164 #5 What statement is true concerning temporary protective grounds used to establish an equipotential zone for the purposes of eliminating the electric shock hazard? #6 Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out?