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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. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The accumulator
The temperature increases
A compression fitting
Must be coiled horizontally and the vapor must flow from top to bottom

2. What is the 'Y' terminal used for on the thermostat...
The contactor coil
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

3. Before energizing a newly installed system - what test should always be done...
Evaporator
The contactor coil
The power from the transformer
Check for tight connections at electrical terminals

4. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Metering device
The power from the transformer
The heating control circuit

5. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
Insulated
The power from the transformer
Metering device

6. 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
Near a return-air grill
Refrigerant must be added to the system
The heating control circuit

7. Which part of the system stores refrigerant until it is needed in the evaporator...
A TXV
The receiver
The accumulator
Must be coiled horizontally and the vapor must flow from top to bottom

8. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The power from the transformer
The suction line must be pitched toward the condensing unit
Must be located in a conspicuous place to serve as an alarm
Check for tight connections at electrical terminals

9. 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 (restrictor)
Evaporator
Condenser
The power from the transformer

10. What type of fitting uses an O-ring to help seal its joint...
The receiver
Compressor
Metering device
A compression fitting

11. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Condenser
The coil is precharged with nitrogen
Near a return-air grill
Precharged refrigeration linesets

12. A split-system air conditioning unit has...
208-volt/240-volt single-phase power supply
Evaporator
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

13. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
24 volts
A TXV
Must be located in a conspicuous place to serve as an alarm

14. 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
Condenser
Compressor
Evaporator

15. What is the 'are' terminal used for on the thermostat...
The power from the transformer
Near a return-air grill
The suction line must be pitched toward the condensing unit
Near a return-air grill

16. An auxiliary drain pan must...

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17. 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
Metering device
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming

18. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
Have a minimum perimeter of 3' larger than the unit being served
Evaporator
The coil is precharged with nitrogen

19. What is the 'G' terminal used for on the thermostat...
Must be located in a conspicuous place to serve as an alarm
Compressor
Refrigerant must be added to the system
The blower relay coil

20. When installing a refrigeration line set through a masonry wall
The accumulator
The heating control circuit
The lines must be covered by PVC to prevent contact with the masonry material
Refrigerant must be added to the system

21. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The temperature increases
Precharged refrigeration linesets
The coil is precharged with nitrogen
Compressor

22. If ductwork is located in an attic or crawl space - it must be...
Refrigerant must be added to the system
Insulated
Metering device
A compression fitting

23. 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
208-volt/240-volt single-phase power supply
This will prevent settling of the ground - which can cause refrigerant line damage

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

25. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The power from the transformer
Metering device
The temperature increases
Condenser

26. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The suction line must be pitched toward the condensing unit
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage
Compressor

27. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The blower relay coil
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser
208-volt/240-volt single-phase power supply

28. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
Metering device
Evaporator
Condenser

29. What is the 'G' terminal used for on the thermostat...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The coil is precharged with nitrogen
Compressor
The blower relay coil

30. What is the purpose for insulating a suction line...
To prevent condensation from forming
The cooling contactor coil
A compression fitting
The receiver

31. A secondary drain line...
The power from the transformer
208-volt/240-volt single-phase power supply
Must be located in a conspicuous place to serve as an alarm
Condenser

32. If ductwork is located in an attic or crawl space - it must be...
Insulated
Compressor
The receiver
Metering device (restrictor)

33. When installing a refrigeration line set through a masonry wall
This will prevent settling of the ground - which can cause refrigerant line damage
The blower relay coil
Must be coiled horizontally and the vapor must flow from top to bottom
The lines must be covered by PVC to prevent contact with the masonry material

34. What is the 'are' terminal used for on the thermostat...
The temperature increases
The power from the transformer
The lines must be covered by PVC to prevent contact with the masonry material
The receiver

35. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
To prevent condensation from forming
The temperature increases
Capillary action
Metering device

36. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser
Capillary action
To prevent condensation from forming

37. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Insulated
Condenser
208-volt/240-volt single-phase power supply
Compressor

38. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Must be located in a conspicuous place to serve as an alarm
The temperature increases
Must be coiled horizontally and the vapor must flow from top to bottom
Insulated

39. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
To prevent condensation from forming
Condenser
Compressor

40. A room thermostat should be mounted...
The contactor coil
The receiver
24 volts
Near a return-air grill

41. 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
24 volts
Evaporator
Precharged refrigeration linesets

42. Quick-connect fittings are commonly used on...
The blower relay coil
Precharged refrigeration linesets
The temperature increases
Near a return-air grill

43. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Condenser
Evaporator
Insulated
The contactor coil

44. Which part of the system prevents liquid from entering the compressor...
Refrigerant must be added to the system
The accumulator
The heating control circuit
The suction line must be pitched toward the condensing unit

45. What is the secondary voltage on a step-down control transformer for a residential furnace...
Check for tight connections at electrical terminals
The receiver
Capillary action
24 volts

46. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The suction line must be pitched toward the condensing unit
Precharged refrigeration linesets
Metering device (restrictor)
The accumulator

47. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
Near a return-air grill
The coil is precharged with nitrogen
Evaporator

48. In a sealed system - as the pressure increases...
The temperature increases
The lines must be covered by PVC to prevent contact with the masonry material
Condenser
A compression fitting

49. 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 coil is precharged with nitrogen
208-volt/240-volt single-phase power supply
Insulated

50. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The contactor coil
The accumulator
Compressor
The suction line must be pitched toward the condensing unit