ESCO Air Conditioning Practice Exam

A thermal electric expansion valve is controlled by

1. ATC Transistor

2. NTC Thermistor

3. Relay

4. Thermostat

The correct answer is: ATC Transistor

A thermal electric expansion valve is controlled by an ATC transistor. An ATC transistor is a type of electronic device that can provide precise control over the flow of electricity to the expansion valve based on the temperature requirements of the system. This allows for accurate regulation of the refrigerant flow in the system to maintain the desired level of cooling. The other options, such as NTC thermistor, relay, and thermostat, are not typically used to directly control a thermal electric expansion valve in the same way that an ATC transistor would.