Electicty Unit 12 Review

A resistor that changes resistance as its temperature changes describes a _______________.

• Thermistor

• Varistor

• Transistor

• Thermocouple

An electronic device used to prevent loads from stopping and starting in rapid secession describes a(n) ______________________.

• Delay-on-make timer

• Delay-on-break timer

• Anti-short-cycling timer

• Magnetic starter

Electronic circuits are sensitive to _______________________.

• Heat

• Current surges and voltage spikes

• Electronic interference

• All of the choices are correct

Electronic controls are used in the heating and cooling industry for ______________.

• Temperature controls

• Motor controls

• Gas furnace controls

• All of the choices are correct

How are the diagnostic codes conveyed to the technician by most electronic gas furnace control modules?

• Audible tones

• Flashing LED codes

• Connecting a diagnostic computer to furnace control module

• All of the choices are correct

The resistance of a negative temperature coefficient thermistor will ____________ as the temperature increases.

• Fluctuate

• Remain the same

• Decrease

• Increase

Thermistors are used in which of the following applications in the heating and cooling industry?

• Sensors for motor overload protection

• Start assist devices for PSC motors

• Temperature sensor to send signals to electronic control modules

• All of the choices are correct

What can a technician use to help them troubleshoot problems with electronic controls?

• Diagnostic codes from the electronic controls

• Troubleshooting charts from the manufacturer

• Wiring diagrams

• All of the choices are correct

What must the technician check when troubleshooting problems with electronic control modules?

• Check the control inputs

• Check the control outputs

• Check for any diagnostic fault codes

• All of the choices are correct

Which of the following is an example of a one-function electronic control device?

• Integrated furnace control module

• Heat pump system control module

• Electronic time delay

• All of the choices are correct