Question 166Motor Plants - Assistant Engineer

The correct answer is D) a pneumatic signal which activates a hydraulic control cylinder allowing the camshaft to shift axially. The component labeled "A" on the engine reversing device is responsible for transmitting a pneumatic signal that activates a hydraulic control cylinder. This allows the camshaft to shift axially, which in turn reverses the direction of the engine. The pneumatic signal is used to control the hydraulic system, rather than using an electric voltage, fuel oil pressure, or direct mechanical shifting of the camshaft followers. The other answer choices are incorrect because they do not accurately describe the function of the "A" component. Option A involves an electric voltage, option B involves a fuel oil pressure signal, and option C involves a direct hydraulic pressure shifting the camshaft followers, rather than the pneumatic-hydraulic system described in the correct answer.