Which of the following is a primary application of servo systems?

Servo systems are designed primarily for precision control of movement and position, making them ideal for applications such as controlling robotic arms. These systems utilize feedback mechanisms to ensure that the desired position or speed is achieved with high accuracy, which is crucial in robotics where exact movements are necessary for tasks such as assembly, welding, or painting.

When it comes to the other applications listed, transforming AC to DC is related to power conversion and does not involve the precise control mechanisms characteristic of servo systems. Boosting signal strength pertains to enhancing signal quality in communication systems, which also does not align with the primary function of servo control. Reducing electrical noise focuses on enhancing the performance of electrical components and systems, but it is not a direct application of servo technology.

Thus, the selection of controlling robotic arms captures the essence of what servo systems are designed to do in real-world scenarios, highlighting their ability to provide responsive and accurate control necessary for such intricate tasks.