Question 1Electricity/Electronics - 1st Asst/Chief70% to pass
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
AI Explanation
The correct answer is C.
The purpose of the "shaft synchro-phasing mode" is to achieve identical shaft speeds and propeller synchronization in order to minimize shaft vibration. This is accomplished by using both the respective shaft speed and shaft position sensors to ensure the propellers are rotating in sync.
The other options are incorrect because:
A) Vibration sensors are not used for this purpose.
B) Achieving identical shaft speeds alone is not enough to minimize vibration without also synchronizing the propeller positions.
D) Cavitation sensors are not involved in this process.
Related Questions
#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 #3 In the twin screw diesel-electric AC propulsion system shown in the illustration, what type of propulsion motors is used? Illustration EL-0164 #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