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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. 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
Refrigerant must be added to the system
To prevent condensation from forming
The cooling contactor coil

2. What type of metering device is used on a 12 SEER split air conditioning system...
Near a return-air grill
The temperature increases
A TXV
The temperature increases

3. What is the 'G' terminal used for on the thermostat...
24 volts
Evaporator
The blower relay coil
Insulated

4. What is the secondary voltage on a step-down control transformer for a residential furnace...
The receiver
Compressor
The suction line must be pitched toward the condensing unit
24 volts

5. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Condenser
24 volts
Insulated

6. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Evaporator
The temperature increases
Metering device (restrictor)
The cooling contactor coil

7. A split-system air conditioning unit has...
The lines must be covered by PVC to prevent contact with the masonry material
The temperature increases
Must be located in a conspicuous place to serve as an alarm
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

8. Which part of the system stores refrigerant until it is needed in the evaporator...
The coil is precharged with nitrogen
Check for tight connections at electrical terminals
The receiver
The accumulator

9. Quick-connect fittings are commonly used on...
The power from the transformer
To prevent condensation from forming
Precharged refrigeration linesets
Capillary action

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

11. 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
Compressor
Metering device
Refrigerant must be added to the system

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

13. What is the 'are' terminal used for on the thermostat...
The power from the transformer
Must be coiled horizontally and the vapor must flow from top to bottom
The coil is precharged with nitrogen
This will prevent settling of the ground - which can cause refrigerant line damage

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

15. In a sealed system - as the pressure increases...
Have a minimum perimeter of 3' larger than the unit being served
A compression fitting
Condenser
The temperature increases

16. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Compressor
208-volt/240-volt single-phase power supply
The accumulator
This will prevent settling of the ground - which can cause refrigerant line damage

17. 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
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action
Condenser

18. A secondary drain line...
A TXV
Evaporator
The coil is precharged with nitrogen
Must be located in a conspicuous place to serve as an alarm

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

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

21. 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 temperature increases
The coil is precharged with nitrogen
A TXV

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

23. What is the 'Y' terminal used for on the thermostat...
Insulated
The cooling contactor coil
The receiver
208-volt/240-volt single-phase power supply

24. What is the 'Y' terminal used for on the thermostat...
The blower relay coil
The suction line must be pitched toward the condensing unit
Check for tight connections at electrical terminals
The cooling contactor coil

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

26. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
The receiver
Must be coiled horizontally and the vapor must flow from top to bottom
The temperature increases

27. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
A compression fitting
The coil is precharged with nitrogen
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The power from the transformer

28. If ductwork is located in an attic or crawl space - it must be...
The contactor coil
Insulated
Evaporator
Must be located in a conspicuous place to serve as an alarm

29. When installing a refrigeration line set through a masonry wall
The lines must be covered by PVC to prevent contact with the masonry material
The receiver
Precharged refrigeration linesets
208-volt/240-volt single-phase power supply

30. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
Near a return-air grill
Metering device (restrictor)
The cooling contactor coil

31. To ensure proper oil return to the compressor - when installing a refrigeration line set...
A compression fitting
The suction line must be pitched toward the condensing unit
Check for tight connections at electrical terminals
The lines must be covered by PVC to prevent contact with the masonry material

32. Before energizing a newly installed system - what test should always be done...
To prevent condensation from forming
Check for tight connections at electrical terminals
The accumulator
Metering device (restrictor)

33. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
This will prevent settling of the ground - which can cause refrigerant line damage
The power from the transformer
A TXV
The contactor coil

34. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Insulated
The suction line must be pitched toward the condensing unit
Check for tight connections at electrical terminals

35. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Metering device (restrictor)
Near a return-air grill
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage

36. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
The blower relay coil
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action

37. Residential split-system outdoor condensing units are commonly wired with a...
Must be coiled horizontally and the vapor must flow from top to bottom
208-volt/240-volt single-phase power supply
The blower relay coil
A compression fitting

38. What is the 'W' terminal used for on the thermostat...
Evaporator
The heating control circuit
The suction line must be pitched toward the condensing unit
The receiver

39. An auxiliary drain pan must...

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40. When installing a refrigeration line set through a masonry wall
The accumulator
208-volt/240-volt single-phase power supply
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material

41. An auxiliary drain pan must...

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42. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
The temperature increases
Capillary action
208-volt/240-volt single-phase power supply

43. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
The contactor coil
Condenser
To prevent condensation from forming

44. Which part of the system prevents liquid from entering the compressor...
The accumulator
Evaporator
The cooling contactor coil
A compression fitting

45. 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
Precharged refrigeration linesets
The lines must be covered by PVC to prevent contact with the masonry material
The receiver

46. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The accumulator
Must be coiled horizontally and the vapor must flow from top to bottom
This will prevent settling of the ground - which can cause refrigerant line damage
Metering device

47. In a sealed system - as the pressure increases...
The temperature increases
The heating control circuit
Insulated
To prevent condensation from forming

48. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Insulated
Condenser
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom

49. A room thermostat should be mounted...
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator
Metering device
Near a return-air grill

50. If ductwork is located in an attic or crawl space - it must be...
A compression fitting
Capillary action
Insulated
The coil is precharged with nitrogen