Test your basic knowledge |

NATE Air Conditioning Components

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is the purpose for insulating a suction line...
A compression fitting
The heating control circuit
To prevent condensation from forming
Compressor

2. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Must be located in a conspicuous place to serve as an alarm
Condenser
The contactor coil
Precharged refrigeration linesets

3. Residential split-system outdoor condensing units are commonly wired with a...
The power from the transformer
24 volts
Evaporator
208-volt/240-volt single-phase power supply

4. A secondary drain line...
208-volt/240-volt single-phase power supply
Evaporator
Must be located in a conspicuous place to serve as an alarm
The blower relay coil

5. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Check for tight connections at electrical terminals
Metering device (restrictor)
The contactor coil

6. A split-system air conditioning unit has...
Near a return-air grill
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Check for tight connections at electrical terminals
The contactor coil

7. Which part of the system prevents liquid from entering the compressor...
The accumulator
The lines must be covered by PVC to prevent contact with the masonry material
To prevent condensation from forming
The heating control circuit

8. What is the 'W' terminal used for on the thermostat...
24 volts
The heating control circuit
208-volt/240-volt single-phase power supply
To prevent condensation from forming

9. When installing a refrigeration line set through a masonry wall
The lines must be covered by PVC to prevent contact with the masonry material
The suction line must be pitched toward the condensing unit
The blower relay coil
Compressor

10. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
The contactor coil
This will prevent settling of the ground - which can cause refrigerant line damage
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

11. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
Must be coiled horizontally and the vapor must flow from top to bottom
Capillary action
24 volts

12. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
A compression fitting
A TXV
The heating control circuit

13. What type of fitting uses an O-ring to help seal its joint...
The contactor coil
Metering device
Refrigerant must be added to the system
A compression fitting

14. In a sealed system - as the pressure increases...
Insulated
The temperature increases
Must be coiled horizontally and the vapor must flow from top to bottom
Evaporator

15. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The temperature increases
The heating control circuit
Insulated
Evaporator

16. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Insulated
Precharged refrigeration linesets
Refrigerant must be added to the system
Must be coiled horizontally and the vapor must flow from top to bottom

17. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Refrigerant must be added to the system
The cooling contactor coil
A TXV
The suction line must be pitched toward the condensing unit

18. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The coil is precharged with nitrogen
Compressor
The cooling contactor coil
Evaporator

19. What is the 'Y' terminal used for on the thermostat...
Compressor
The cooling contactor coil
The lines must be covered by PVC to prevent contact with the masonry material
This will prevent settling of the ground - which can cause refrigerant line damage

20. If ductwork is located in an attic or crawl space - it must be...
The receiver
Metering device
Insulated
208-volt/240-volt single-phase power supply

21. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
The blower relay coil
The contactor coil
Condenser

22. What is the 'Y' terminal used for on the thermostat...
Evaporator
A TXV
The cooling contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

23. What type of metering device is used on a 12 SEER split air conditioning system...
Metering device
A TXV
The contactor coil
To prevent condensation from forming

24. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
Condenser
A TXV
The cooling contactor coil

25. Which part of the system prevents liquid from entering the compressor...
To prevent condensation from forming
The accumulator
Compressor
The blower relay coil

26. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
This will prevent settling of the ground - which can cause refrigerant line damage
Precharged refrigeration linesets
Capillary action
Evaporator

27. Residential split-system outdoor condensing units are commonly wired with a...
Metering device (restrictor)
Have a minimum perimeter of 3' larger than the unit being served
208-volt/240-volt single-phase power supply
24 volts

28. What is the 'are' terminal used for on the thermostat...
Check for tight connections at electrical terminals
Refrigerant must be added to the system
The power from the transformer
Condenser

29. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The suction line must be pitched toward the condensing unit
Precharged refrigeration linesets
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator

30. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The coil is precharged with nitrogen
The contactor coil
Metering device (restrictor)

31. What type of fitting uses an O-ring to help seal its joint...
Compressor
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The blower relay coil
A compression fitting

32. What is the 'are' terminal used for on the thermostat...
24 volts
The power from the transformer
Refrigerant must be added to the system
The temperature increases

33. When installing a refrigeration line set through a masonry wall
Have a minimum perimeter of 3' larger than the unit being served
Must be located in a conspicuous place to serve as an alarm
The lines must be covered by PVC to prevent contact with the masonry material
The receiver

34. What is the 'W' terminal used for on the thermostat...
The contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The receiver
The heating control circuit

35. In a sealed system - as the pressure increases...
Check for tight connections at electrical terminals
The cooling contactor coil
The temperature increases
Have a minimum perimeter of 3' larger than the unit being served

36. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Precharged refrigeration linesets
Evaporator
Near a return-air grill
The power from the transformer

37. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Metering device
Check for tight connections at electrical terminals
Have a minimum perimeter of 3' larger than the unit being served
The suction line must be pitched toward the condensing unit

38. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

39. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
Capillary action
The accumulator
Must be located in a conspicuous place to serve as an alarm

40. Before energizing a newly installed system - what test should always be done...
Metering device
Near a return-air grill
The temperature increases
Check for tight connections at electrical terminals

41. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Compressor
Metering device
Condenser
The suction line must be pitched toward the condensing unit

42. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
The lines must be covered by PVC to prevent contact with the masonry material
Precharged refrigeration linesets
This will prevent settling of the ground - which can cause refrigerant line damage

43. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
To prevent condensation from forming
Condenser
Metering device (restrictor)
Evaporator

44. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
24 volts
Metering device
Compressor
Insulated

45. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
Metering device
The receiver
Metering device (restrictor)

46. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The blower relay coil
The power from the transformer
The suction line must be pitched toward the condensing unit
Evaporator

47. A secondary drain line...
To prevent condensation from forming
Precharged refrigeration linesets
The suction line must be pitched toward the condensing unit
Must be located in a conspicuous place to serve as an alarm

48. A room thermostat should be mounted...
Evaporator
Condenser
Condenser
Near a return-air grill

49. What is the secondary voltage on a step-down control transformer for a residential furnace...
The suction line must be pitched toward the condensing unit
Compressor
Evaporator
24 volts

50. A room thermostat should be mounted...
The power from the transformer
Evaporator
Check for tight connections at electrical terminals
Near a return-air grill