What does the acronym ATC stand for?

• A. Analog temperature controls
• B. Automatic temperature controls
• C. Auto-trace controls
• D. Air temperature compensation

Answer: (B)

ATC refers to automatic temperature controls, the system that automatically keeps a space at its set temperature using feedback from sensors. In building automation and commissioning, this term describes a closed-loop setup where a thermostat or sensor measures the current temperature, a controller compares it to the desired setpoint, and actuators (like valves or fans) adjust heating or cooling to maintain that setpoint. That makes this option the correct match for the acronym. The other phrases don’t reflect a standard naming for a control system: analog temperature controls would imply non-digital or non-automatic operation, auto-trace controls isn’t a recognized term in this context, and air temperature compensation describes adjustment methods rather than a labeled automatic control system.