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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 - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
Evaporator
Check for tight connections at electrical terminals
24 volts

2. An auxiliary drain pan must...

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3. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
A compression fitting
To prevent condensation from forming
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material

4. What type of metering device is used on a 12 SEER split air conditioning system...
Evaporator
Have a minimum perimeter of 3' larger than the unit being served
A TXV
The lines must be covered by PVC to prevent contact with the masonry material

5. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Compressor
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
Insulated

6. A secondary drain line...
208-volt/240-volt single-phase power supply
This will prevent settling of the ground - which can cause refrigerant line damage
This will prevent settling of the ground - which can cause refrigerant line damage
Must be located in a conspicuous place to serve as an alarm

7. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Compressor
Capillary action
Condenser
The coil is precharged with nitrogen

8. Which part of the system prevents liquid from entering the compressor...
Near a return-air grill
The heating control circuit
The accumulator
208-volt/240-volt single-phase power supply

9. What is the 'are' terminal used for on the thermostat...
208-volt/240-volt single-phase power supply
The accumulator
The power from the transformer
24 volts

10. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
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
Condenser

11. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
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
Capillary action
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

12. Residential split-system outdoor condensing units are commonly wired with a...
Condenser
A compression fitting
Insulated
208-volt/240-volt single-phase power supply

13. What is the purpose for insulating a suction line...
Check for tight connections at electrical terminals
Metering device (restrictor)
To prevent condensation from forming
The heating control circuit

14. 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
Refrigerant must be added to the system
The accumulator
Have a minimum perimeter of 3' larger than the unit being served

15. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Evaporator
Compressor
Condenser
Refrigerant must be added to the system

16. What is the 'Y' terminal used for on the thermostat...
Metering device (restrictor)
208-volt/240-volt single-phase power supply
The cooling contactor coil
Condenser

17. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Metering device
The suction line must be pitched toward the condensing unit
The cooling contactor coil
Condenser

18. Which part of the system prevents liquid from entering the compressor...
The suction line must be pitched toward the condensing unit
Compressor
The accumulator
Must be coiled horizontally and the vapor must flow from top to bottom

19. If ductwork is located in an attic or crawl space - it must be...
Compressor
Metering device
A compression fitting
Insulated

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

21. An auxiliary drain pan must...

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

23. 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
208-volt/240-volt single-phase power supply
The receiver
A TXV

24. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Have a minimum perimeter of 3' larger than the unit being served
Refrigerant must be added to the system
A TXV

25. 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
A compression fitting
Insulated
The receiver

26. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
Compressor
Evaporator
This will prevent settling of the ground - which can cause refrigerant line damage

27. 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
The contactor coil
The blower relay coil
Compressor

28. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm

29. 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
Evaporator
The temperature increases
Near a return-air grill

30. A room thermostat should be mounted...
Metering device
Refrigerant must be added to the system
Near a return-air grill
Precharged refrigeration linesets

31. In a sealed system - as the pressure increases...
The temperature increases
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator
Near a return-air grill

32. Before energizing a newly installed system - what test should always be done...
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
208-volt/240-volt single-phase power supply

33. 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
A TXV
24 volts
Metering device (restrictor)

34. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
A compression fitting
Near a return-air grill
To prevent condensation from forming

35. A split-system air conditioning unit has...
The blower relay coil
Metering device
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Insulated

36. Quick-connect fittings are commonly used on...
The temperature increases
208-volt/240-volt single-phase power supply
Compressor
Precharged refrigeration linesets

37. What is the purpose for insulating a suction line...
Metering device (restrictor)
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom
To prevent condensation from forming

38. What type of metering device is used on a 12 SEER split air conditioning system...
Metering device
The lines must be covered by PVC to prevent contact with the masonry material
A TXV
Compressor

39. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Insulated
Metering device (restrictor)
To prevent condensation from forming
A compression fitting

40. A secondary drain line...
Compressor
Near a return-air grill
Capillary action
Must be located in a conspicuous place to serve as an alarm

41. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
This will prevent settling of the ground - which can cause refrigerant line damage
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device (restrictor)
A compression fitting

42. What type of fitting uses an O-ring to help seal its joint...
Insulated
To prevent condensation from forming
Evaporator
A compression fitting

43. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Condenser
The blower relay coil
The heating control circuit
To prevent condensation from forming

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

45. What is the secondary voltage on a step-down control transformer for a residential furnace...
The receiver
24 volts
Precharged refrigeration linesets
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

46. A split-system air conditioning unit has...
The temperature increases
Metering device
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Metering device (restrictor)

47. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Capillary action
Compressor
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

48. What is the secondary voltage on a step-down control transformer for a residential furnace...
Have a minimum perimeter of 3' larger than the unit being served
Evaporator
24 volts
Must be coiled horizontally and the vapor must flow from top to bottom

49. What is the 'are' terminal used for on the thermostat...
Evaporator
The power from the transformer
Condenser
Check for tight connections at electrical terminals

50. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Condenser
The receiver
Metering device
Precharged refrigeration linesets