Question 2General Subjects - 1st Asst/Chief

The correct answer is C) The signal in a controller that is obtained by subtracting the measured value of the controlled value from the set point. In a closed-loop process control system, error refers to the difference between the desired or set point value and the actual measured value of the controlled variable. This error signal is used by the controller to make adjustments to the process in order to bring the actual value closer to the desired set point. The goal is to minimize this error to achieve the desired control of the system. The other options are incorrect because they do not accurately describe the meaning of error in a closed-loop control system. Option A refers to damping of oscillations, option B describes the desired control response, and option D is the definition of gain, not error.