Electricity unit 12 review

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

• Thermistor
• Thermostat

• Thermocouple

• Thermometer

An electronic device that converts pressure into electrical signals that can be used by electronic control modules describes a _________________.

• Transducer

• Thermistor

• Transistor

• Pressure switch

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

An electronically controlled valve that controls the flow rate of refrigerant into a refrigeration evaporator based upon operating conditions of the system describes a(n) __________________.

• Solenoid valve

• Electronic expansion valve

• Thermostatic expansion valve

• Reversing valve

Cad cells used to detect the flame on oil furnaces experience a change of resistance in the presence of ____________________.

• Light

• Heat

• Oil pressure

• Smoke

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

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