Question 2Electricity & Electronics - 1st Asst/Chief

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.