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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. An auxiliary drain pan must...

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2. What is the purpose for insulating a suction line...
The blower relay coil
Near a return-air grill
To prevent condensation from forming
Metering device (restrictor)

3. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Have a minimum perimeter of 3' larger than the unit being served
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator
Metering device (restrictor)

4. A room thermostat should be mounted...
Near a return-air grill
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system
The coil is precharged with nitrogen

5. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The coil is precharged with nitrogen
Capillary action
Condenser
Must be located in a conspicuous place to serve as an alarm

6. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
A compression fitting
A TXV
The coil is precharged with nitrogen

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

8. 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
Metering device
The contactor coil
Condenser

9. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
Condenser
Capillary action
The heating control circuit

10. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Metering device (restrictor)
Near a return-air grill
The coil is precharged with nitrogen
The temperature increases

11. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Have a minimum perimeter of 3' larger than the unit being served
Insulated
Near a return-air grill
Compressor

12. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Have a minimum perimeter of 3' larger than the unit being served
The receiver
A compression fitting
The coil is precharged with nitrogen

13. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Condenser
The heating control circuit
Compressor
The cooling contactor coil

14. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Must be coiled horizontally and the vapor must flow from top to bottom
Capillary action
The blower relay coil
The cooling contactor coil

15. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Condenser
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator

16. A split-system air conditioning unit has...
Compressor
The coil is precharged with nitrogen
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser

17. If ductwork is located in an attic or crawl space - it must be...
Insulated
Capillary action
The coil is precharged with nitrogen
Condenser

18. A secondary drain line...
Insulated
Must be located in a conspicuous place to serve as an alarm
Precharged refrigeration linesets
A compression fitting

19. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
To prevent condensation from forming
A TXV
A TXV

20. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
A TXV
Metering device
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

21. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
The blower relay coil
The suction line must be pitched toward the condensing unit
Insulated

22. When installing a refrigeration line set through a masonry wall
The power from the transformer
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

23. If ductwork is located in an attic or crawl space - it must be...
This will prevent settling of the ground - which can cause refrigerant line damage
The heating control circuit
The power from the transformer
Insulated

24. What type of fitting uses an O-ring to help seal its joint...
The power from the transformer
The accumulator
A compression fitting
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

25. What is the 'Y' terminal used for on the thermostat...
The heating control circuit
The cooling contactor coil
The receiver
Near a return-air grill

26. A secondary drain line...
Condenser
Compressor
The accumulator
Must be located in a conspicuous place to serve as an alarm

27. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Near a return-air grill
Metering device (restrictor)
The accumulator
The cooling contactor coil

28. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Insulated
Near a return-air grill
Must be located in a conspicuous place to serve as an alarm
This will prevent settling of the ground - which can cause refrigerant line damage

29. An auxiliary drain pan must...

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30. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Refrigerant must be added to the system
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator

31. What is the 'W' terminal used for on the thermostat...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser
The heating control circuit
24 volts

32. What is the purpose for insulating a suction line...
A TXV
Must be coiled horizontally and the vapor must flow from top to bottom
Must be located in a conspicuous place to serve as an alarm
To prevent condensation from forming

33. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Near a return-air grill
Evaporator
The coil is precharged with nitrogen

34. What is the 'are' terminal used for on the thermostat...
A compression fitting
Have a minimum perimeter of 3' larger than the unit being served
The power from the transformer
Check for tight connections at electrical terminals

35. In a sealed system - as the pressure increases...
The coil is precharged with nitrogen
The temperature increases
Precharged refrigeration linesets
The blower relay coil

36. In a sealed system - as the pressure increases...
Near a return-air grill
Compressor
The temperature increases
The blower relay coil

37. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The cooling contactor coil
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage
The receiver

38. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
24 volts
The temperature increases
The receiver

39. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
Must be located in a conspicuous place to serve as an alarm
Near a return-air grill
Must be located in a conspicuous place to serve as an alarm

40. What is the 'G' terminal used for on the thermostat...
To prevent condensation from forming
Near a return-air grill
The blower relay coil
The heating control circuit

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

42. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The accumulator
Condenser
The suction line must be pitched toward the condensing unit
Precharged refrigeration linesets

43. What is the secondary voltage on a step-down control transformer for a residential furnace...
The heating control circuit
Metering device (restrictor)
24 volts
The coil is precharged with nitrogen

44. Which part of the system prevents liquid from entering the compressor...
The cooling contactor coil
The accumulator
Refrigerant must be added to the system
Have a minimum perimeter of 3' larger than the unit being served

45. What type of metering device is used on a 12 SEER split air conditioning system...
The heating control circuit
Precharged refrigeration linesets
A TXV
The temperature increases

46. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Evaporator
Metering device (restrictor)
The coil is precharged with nitrogen
Evaporator

47. Which part of the system prevents liquid from entering the compressor...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The accumulator
Refrigerant must be added to the system
Must be coiled horizontally and the vapor must flow from top to bottom

48. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Must be coiled horizontally and the vapor must flow from top to bottom
The contactor coil
The coil is precharged with nitrogen
The suction line must be pitched toward the condensing unit

49. A room thermostat should be mounted...
Near a return-air grill
The suction line must be pitched toward the condensing unit
Must be coiled horizontally and the vapor must flow from top to bottom
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

50. What is the 'Y' terminal used for on the thermostat...
The blower relay coil
The cooling contactor coil
24 volts
Near a return-air grill