Question 10 (5 points) An air-conditioning system's automatic controller might directly control the A) motor of a large condenser fan. B) thermostat's setpoint temperature. C) conversion of pneumatic energy to hydraulic signal pressure. D) sensitivity of the ladder logic.

The correct answer is: **A) motor of a large condenser fan.** **Explanation:** An automatic controller in an air-conditioning system is responsible for regulating various components to maintain the desired environmental conditions. One of the primary components it directly controls is the motor of the large condenser fan. By adjusting the fan motor's speed, the controller can regulate the heat exchange process, ensuring efficient cooling performance. - **Option B** involves setting the thermostat's temperature, which is typically a user-defined parameter rather than directly controlled by the system's automatic controller. - **Option C** pertains to energy conversion processes that are generally part of broader system functionalities and not directly managed by the controller in day-to-day operations. - **Option D** relates to ladder logic sensitivity, which deals with programming aspects of controllers (like PLCs) and is not a direct control function within the air-conditioning system's operational framework. **Answer:** A) motor of a large condenser fan.