Question 159General Subjects - 1st Asst/Chief

The correct answer is C. The thrust direction of the steerable internal duct thruster is determined by the orientation of the water discharge vectoring ring. The water discharge vectoring ring, also known as the steering nozzle, is the key component that allows the thrust direction of the steerable internal duct thruster to be controlled. By rotating the vectoring ring, the direction of the water discharge can be changed, which in turn changes the thrust direction of the thruster. This is the primary mechanism by which the thrust direction is controlled, rather than the other options provided. The other answer choices are incorrect because they do not accurately describe how the thrust direction is determined in a steerable internal duct thruster system.