The correct answer is: B. Feedback
A closed-loop system is a system that uses feedback to control its output. This means that the system measures its own output and uses that information to adjust its input. This allows the system to maintain a desired output even in the face of disturbances.
An open-loop system does not use feedback. This means that the system’s output is not affected by its own output. This can make it difficult for open-loop systems to maintain a desired output in the face of disturbances.
Servomechanism is a device or system that uses feedback to control a mechanism. This is a type of closed-loop system.
Output pattern is the pattern of the output of a system. This can be affected by the system’s input, the system’s parameters, and the system’s disturbances.
Input pattern is the pattern of the input of a system. This can affect the system’s output, the system’s parameters, and the system’s disturbances.