Which one of the following is not a component of a gyroscope?

The correct choice is a control system because a gyroscope primarily consists of mechanical and practical elements that contribute to its ability to maintain orientation and stability. The fundamental components of a gyroscope include the rotor, which is the spinning wheel or disk that provides angular momentum; gimbal rings, which allow the rotor to pivot freely in multiple directions; and a support mount, which holds the gyroscope in place while allowing it to maintain its orientation as it spins.

On the other hand, while a control system may be associated with gyroscopic technology, especially in the context of modern applications like navigation systems or stabilizers, it is not a physical component of a basic gyroscope. Instead, the control system is typically an external system that manages the data and signals from the gyroscope for various applications, rather than being a direct mechanical part of it. Thus, identifying the control system as not being a fundamental component clarifies its role in relation to the traditional mechanical structure of a gyroscope.