Question 2Electricity/Electronics - 1st Asst/Chief70% to pass
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
AI Explanation
The correct answer is D.
The current control pulse signal controls the motor torque, while the frequency control pulse signal controls the motor rotational speed. This is because in a twin-screw diesel-electric AC propulsion system, the current determines the torque output of the electric motors, while the frequency of the supply controls the rotational speed of the motors.
The other options are incorrect because they do not accurately describe the relationship between the control pulse signals and the motor parameters. For example, option A incorrectly states that the current control pulse signal controls the motor power factor, which is not the case.
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 #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 #5 What statement is true concerning temporary protective grounds used to establish an equipotential zone for the purposes of eliminating the electric shock hazard?