A proportional control system is used to regulate the temperature of a heater by adjusting the ON/OFF cycle time. What is the main feature of a proportional controller in temperature regulation?

Correct option is B

​$$\text{In a proportional (P) controller, the control action is proportional to the error between the desired set point temperature and the actual temperature.} \\[8pt]\bullet \ \text{When the temperature is far from the set point, the heater is ON for a longer duration (more power).} \\[4pt]\bullet \ \text{As the temperature approaches the set point, the error decreases, and the controller reduces the ON time / power.} \\[4pt]\bullet \ \text{This prevents excessive overshoot and improves temperature stability.}$$​​