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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. Which part of the system stores refrigerant until it is needed in the evaporator...
Metering device
The power from the transformer
The receiver
Near a return-air grill

2. When installing a refrigeration line set through a masonry wall
24 volts
208-volt/240-volt single-phase power supply
The heating control circuit
The lines must be covered by PVC to prevent contact with the masonry material

3. Quick-connect fittings are commonly used on...
The blower relay coil
Precharged refrigeration linesets
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil

4. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Compressor
Condenser
The receiver
Near a return-air grill

5. 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
The suction line must be pitched toward the condensing unit
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Check for tight connections at electrical terminals

6. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Must be located in a conspicuous place to serve as an alarm
24 volts
The contactor coil
The coil is precharged with nitrogen

7. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The coil is precharged with nitrogen
Must be coiled horizontally and the vapor must flow from top to bottom
Compressor
Have a minimum perimeter of 3' larger than the unit being served

8. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The power from the transformer
Metering device (restrictor)
Insulated
Near a return-air grill

9. What is the 'G' terminal used for on the thermostat...
Compressor
208-volt/240-volt single-phase power supply
24 volts
The blower relay coil

10. 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
Evaporator
208-volt/240-volt single-phase power supply
Insulated

11. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser
Metering device (restrictor)
The coil is precharged with nitrogen

12. What type of fitting uses an O-ring to help seal its joint...
Capillary action
Insulated
A compression fitting
Insulated

13. A room thermostat should be mounted...
208-volt/240-volt single-phase power supply
Near a return-air grill
Metering device
To prevent condensation from forming

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

15. What is the 'W' terminal used for on the thermostat...
The heating control circuit
This will prevent settling of the ground - which can cause refrigerant line damage
The accumulator
To prevent condensation from forming

16. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
The heating control circuit
Evaporator
Refrigerant must be added to the system
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

17. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The heating control circuit
Evaporator
To prevent condensation from forming
The contactor coil

18. Before energizing a newly installed system - what test should always be done...
208-volt/240-volt single-phase power supply
Compressor
The lines must be covered by PVC to prevent contact with the masonry material
Check for tight connections at electrical terminals

19. An auxiliary drain pan must...

20. What is the 'G' terminal used for on the thermostat...
Insulated
The blower relay coil
The heating control circuit
Compressor

21. What is the secondary voltage on a step-down control transformer for a residential furnace...
Evaporator
The temperature increases
Compressor
24 volts

22. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The lines must be covered by PVC to prevent contact with the masonry material
Compressor
The blower relay coil
Insulated

23. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Compressor
Condenser
Metering device
The blower relay coil

24. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
Compressor
Must be coiled horizontally and the vapor must flow from top to bottom
Compressor

25. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
208-volt/240-volt single-phase power supply
The contactor coil
The power from the transformer

26. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system
Must be located in a conspicuous place to serve as an alarm
Metering device

27. What is the secondary voltage on a step-down control transformer for a residential furnace...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The coil is precharged with nitrogen
Must be coiled horizontally and the vapor must flow from top to bottom
24 volts

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

29. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
Near a return-air grill
The heating control circuit
Metering device (restrictor)

30. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The contactor coil
This will prevent settling of the ground - which can cause refrigerant line damage
A compression fitting
Evaporator

31. What is the purpose for insulating a suction line...
The contactor coil
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
To prevent condensation from forming

32. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
This will prevent settling of the ground - which can cause refrigerant line damage
Compressor
The power from the transformer
The accumulator

33. What is the 'are' terminal used for on the thermostat...
The coil is precharged with nitrogen
This will prevent settling of the ground - which can cause refrigerant line damage
The power from the transformer
Metering device (restrictor)

34. If ductwork is located in an attic or crawl space - it must be...
24 volts
Insulated
A compression fitting
Must be located in a conspicuous place to serve as an alarm

35. Quick-connect fittings are commonly used on...
The contactor coil
Evaporator
The power from the transformer
Precharged refrigeration linesets

36. What is the 'are' terminal used for on the thermostat...
The power from the transformer
The blower relay coil
24 volts
Insulated

37. When installing a refrigeration line set through a masonry wall
The lines must be covered by PVC to prevent contact with the masonry material
24 volts
Evaporator
Compressor

38. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
Evaporator
24 volts
A compression fitting

39. A split-system air conditioning unit has...
The heating control circuit
To prevent condensation from forming
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Must be coiled horizontally and the vapor must flow from top to bottom

40. A split-system air conditioning unit has...
This will prevent settling of the ground - which can cause refrigerant line damage
Metering device
The cooling contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

41. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The heating control circuit
The accumulator
Must be coiled horizontally and the vapor must flow from top to bottom
The contactor coil

42. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Precharged refrigeration linesets
Have a minimum perimeter of 3' larger than the unit being served
Condenser
The cooling contactor coil

43. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The coil is precharged with nitrogen
The contactor coil
Metering device (restrictor)
Compressor

44. Which part of the system stores refrigerant until it is needed in the evaporator...
The lines must be covered by PVC to prevent contact with the masonry material
Near a return-air grill
The receiver
Metering device (restrictor)

45. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Evaporator
The contactor coil
Evaporator
Near a return-air grill

46. What is the 'W' terminal used for on the thermostat...
The heating control circuit
A TXV
Compressor
The contactor coil

47. Which part of the system prevents liquid from entering the compressor...
To prevent condensation from forming
The suction line must be pitched toward the condensing unit
The accumulator
Near a return-air grill

48. A room thermostat should be mounted...
The lines must be covered by PVC to prevent contact with the masonry material
Near a return-air grill
The accumulator
The lines must be covered by PVC to prevent contact with the masonry material

49. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Metering device
A TXV
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage

50. Which part of the system prevents liquid from entering the compressor...
Check for tight connections at electrical terminals
Must be coiled horizontally and the vapor must flow from top to bottom
The heating control circuit
The accumulator