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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. If ductwork is located in an attic or crawl space - it must be...
Insulated
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Near a return-air grill
The coil is precharged with nitrogen

2. What is the secondary voltage on a step-down control transformer for a residential furnace...
Evaporator
Capillary action
Must be located in a conspicuous place to serve as an alarm
24 volts

3. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
A compression fitting
Capillary action
Condenser
Have a minimum perimeter of 3' larger than the unit being served

4. What is the secondary voltage on a step-down control transformer for a residential furnace...
The temperature increases
24 volts
Check for tight connections at electrical terminals
Have a minimum perimeter of 3' larger than the unit being served

5. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Compressor
Metering device
Insulated
Refrigerant must be added to the system

6. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
Near a return-air grill
Condenser
A TXV

7. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Evaporator
24 volts
The power from the transformer

8. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
208-volt/240-volt single-phase power supply
Evaporator
The suction line must be pitched toward the condensing unit

9. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The receiver
This will prevent settling of the ground - which can cause refrigerant line damage
The coil is precharged with nitrogen
Evaporator

10. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
Precharged refrigeration linesets
The power from the transformer
The lines must be covered by PVC to prevent contact with the masonry material

11. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Compressor
The accumulator
The coil is precharged with nitrogen
Must be coiled horizontally and the vapor must flow from top to bottom

12. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Capillary action
Metering device
The suction line must be pitched toward the condensing unit
Evaporator

13. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
24 volts
Precharged refrigeration linesets
The contactor coil

14. What is the 'G' terminal used for on the thermostat...
The blower relay coil
208-volt/240-volt single-phase power supply
The accumulator
Refrigerant must be added to the system

15. What is the purpose for insulating a suction line...
To prevent condensation from forming
A compression fitting
Check for tight connections at electrical terminals
The receiver

16. Why is it recommended to add a gravel fill under the pad of a condensing unit...
This will prevent settling of the ground - which can cause refrigerant line damage
The coil is precharged with nitrogen
Insulated
Metering device (restrictor)

17. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Near a return-air grill
24 volts
Capillary action
The power from the transformer

18. What is the 'Y' terminal used for on the thermostat...
The cooling contactor coil
The lines must be covered by PVC to prevent contact with the masonry material
The blower relay coil
The lines must be covered by PVC to prevent contact with the masonry material

19. In a sealed system - as the pressure increases...
Evaporator
Check for tight connections at electrical terminals
The temperature increases
Metering device (restrictor)

20. If ductwork is located in an attic or crawl space - it must be...
Insulated
A compression fitting
Evaporator
The cooling contactor coil

21. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
This will prevent settling of the ground - which can cause refrigerant line damage
The coil is precharged with nitrogen
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom

22. 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
Must be located in a conspicuous place to serve as an alarm
Evaporator
Refrigerant must be added to the system

23. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Must be coiled horizontally and the vapor must flow from top to bottom
The temperature increases
To prevent condensation from forming
The suction line must be pitched toward the condensing unit

24. A secondary drain line...
The lines must be covered by PVC to prevent contact with the masonry material
Must be located in a conspicuous place to serve as an alarm
Refrigerant must be added to the system
Evaporator

25. Which part of the system stores refrigerant until it is needed in the evaporator...
A TXV
The power from the transformer
Condenser
The receiver

26. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Capillary action
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator
Metering device (restrictor)

27. When installing a refrigeration line set through a masonry wall
The blower relay coil
The cooling contactor coil
The lines must be covered by PVC to prevent contact with the masonry material
The blower relay coil

28. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Must be located in a conspicuous place to serve as an alarm
The receiver
Metering device
Evaporator

29. When installing a refrigeration line set through a masonry wall
The heating control circuit
The lines must be covered by PVC to prevent contact with the masonry material
Insulated
Must be coiled horizontally and the vapor must flow from top to bottom

30. 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
To prevent condensation from forming
Evaporator
Check for tight connections at electrical terminals

31. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The blower relay coil
Check for tight connections at electrical terminals
To prevent condensation from forming
Condenser

32. An auxiliary drain pan must...

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33. An auxiliary drain pan must...

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34. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
To prevent condensation from forming
Refrigerant must be added to the system
The blower relay coil
Must be coiled horizontally and the vapor must flow from top to bottom

35. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
This will prevent settling of the ground - which can cause refrigerant line damage
The lines must be covered by PVC to prevent contact with the masonry material
Refrigerant must be added to the system

36. What type of metering device is used on a 12 SEER split air conditioning system...
A compression fitting
A TXV
Have a minimum perimeter of 3' larger than the unit being served
The receiver

37. What is the 'W' terminal used for on the thermostat...
Must be coiled horizontally and the vapor must flow from top to bottom
The heating control circuit
The accumulator
A compression fitting

38. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Insulated
Condenser
A compression fitting
The heating control circuit

39. What is the 'Y' terminal used for on the thermostat...
The cooling contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
To prevent condensation from forming
Refrigerant must be added to the system

40. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The power from the transformer
The accumulator
Refrigerant must be added to the system
Condenser

41. What type of fitting uses an O-ring to help seal its joint...
Metering device (restrictor)
The contactor coil
A compression fitting
Must be coiled horizontally and the vapor must flow from top to bottom

42. A secondary drain line...
Compressor
Capillary action
The temperature increases
Must be located in a conspicuous place to serve as an alarm

43. What type of fitting uses an O-ring to help seal its joint...
To prevent condensation from forming
Check for tight connections at electrical terminals
A compression fitting
The blower relay coil

44. Quick-connect fittings are commonly used on...
Compressor
The receiver
Precharged refrigeration linesets
Near a return-air grill

45. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Must be located in a conspicuous place to serve as an alarm
The blower relay coil
The power from the transformer
Compressor

46. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Evaporator
The contactor coil
Refrigerant must be added to the system
Compressor

47. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
The heating control circuit
Capillary action
The cooling contactor coil

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

49. Which part of the system stores refrigerant until it is needed in the evaporator...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The heating control circuit
Metering device (restrictor)
The receiver

50. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The temperature increases
The heating control circuit
Precharged refrigeration linesets
This will prevent settling of the ground - which can cause refrigerant line damage