Question 247General Subjects - 1st Asst/Chief

The correct answer is A) Proportional. In a PID control loop, the proportional function is the dominant factor in the controller's performance. The proportional term provides the main control action, directly responding to the error between the set point and the process variable. The integral and derivative terms serve to improve the overall performance and stability of the control loop, but the proportional function is the primary driver of the controller's output. The other options are incorrect because the proportional term is the most significant component, not the derivative and proportional terms (B), the integral and derivative terms (C), or all being equally important (D).