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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. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Capillary action
The accumulator
The temperature increases

2. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The accumulator
Condenser
The contactor coil
A TXV

3. Which part of the system prevents liquid from entering the compressor...
Must be coiled horizontally and the vapor must flow from top to bottom
Have a minimum perimeter of 3' larger than the unit being served
The cooling contactor coil
The accumulator

4. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
The power from the transformer
The lines must be covered by PVC to prevent contact with the masonry material
Must be coiled horizontally and the vapor must flow from top to bottom

5. What is the 'W' terminal used for on the thermostat...
The heating control circuit
Must be located in a conspicuous place to serve as an alarm
Condenser
A TXV

6. Quick-connect fittings are commonly used on...
To prevent condensation from forming
Insulated
The suction line must be pitched toward the condensing unit
Precharged refrigeration linesets

7. What type of fitting uses an O-ring to help seal its joint...
Condenser
A compression fitting
The coil is precharged with nitrogen
The heating control circuit

8. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action
The accumulator
A compression fitting

9. Before energizing a newly installed system - what test should always be done...
The contactor coil
Compressor
A compression fitting
Check for tight connections at electrical terminals

10. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Evaporator
Metering device (restrictor)
Must be coiled horizontally and the vapor must flow from top to bottom

11. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
The blower relay coil
Have a minimum perimeter of 3' larger than the unit being served
A TXV

12. When installing a refrigeration line set through a masonry wall
Near a return-air grill
To prevent condensation from forming
The temperature increases
The lines must be covered by PVC to prevent contact with the masonry material

13. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The blower relay coil
The temperature increases
Metering device
Must be located in a conspicuous place to serve as an alarm

14. Which part of the system prevents liquid from entering the compressor...
Near a return-air grill
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Have a minimum perimeter of 3' larger than the unit being served
The accumulator

15. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
A compression fitting
Metering device (restrictor)
Metering device (restrictor)
Capillary action

16. What is the purpose for insulating a suction line...
Must be located in a conspicuous place to serve as an alarm
A compression fitting
The contactor coil
To prevent condensation from forming

17. 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
This will prevent settling of the ground - which can cause refrigerant line damage
Near a return-air grill
Check for tight connections at electrical terminals

18. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
The coil is precharged with nitrogen
Evaporator
Condenser

19. What is the 'Y' terminal used for on the thermostat...
Metering device
To prevent condensation from forming
The cooling contactor coil
The lines must be covered by PVC to prevent contact with the masonry material

20. In a sealed system - as the pressure increases...
The cooling contactor coil
A TXV
The temperature increases
Have a minimum perimeter of 3' larger than the unit being served

21. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser
24 volts

22. What is the 'W' terminal used for on the thermostat...
Refrigerant must be added to the system
The heating control circuit
Precharged refrigeration linesets
24 volts

23. What type of fitting uses an O-ring to help seal its joint...
Metering device (restrictor)
The cooling contactor coil
A compression fitting
Near a return-air grill

24. Which part of the system stores refrigerant until it is needed in the evaporator...
208-volt/240-volt single-phase power supply
Insulated
The receiver
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

25. If ductwork is located in an attic or crawl space - it must be...
The receiver
Evaporator
Insulated
Check for tight connections at electrical terminals

26. What is the 'G' terminal used for on the thermostat...
Insulated
The blower relay coil
A compression fitting
The power from the transformer

27. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Insulated
A TXV
The contactor coil
Evaporator

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

29. Before energizing a newly installed system - what test should always be done...
The contactor coil
Check for tight connections at electrical terminals
The receiver
A TXV

30. What is the 'G' terminal used for on the thermostat...
The lines must be covered by PVC to prevent contact with the masonry material
The blower relay coil
Condenser
The cooling contactor coil

31. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
Compressor
24 volts
The power from the transformer

32. 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
Condenser
The coil is precharged with nitrogen
This will prevent settling of the ground - which can cause refrigerant line damage

33. What is the purpose for insulating a suction line...
To prevent condensation from forming
Metering device (restrictor)
Evaporator
The heating control circuit

34. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Near a return-air grill
Compressor
The blower relay coil
Condenser

35. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
Capillary action
Condenser
A TXV

36. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
Condenser
208-volt/240-volt single-phase power supply
The accumulator

37. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system
Capillary action

38. 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
The receiver
Capillary action
Metering device

39. 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
The suction line must be pitched toward the condensing unit
The accumulator
Condenser

40. An auxiliary drain pan must...

41. 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
Capillary action
The suction line must be pitched toward the condensing unit
Compressor

42. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Condenser
The receiver
This will prevent settling of the ground - which can cause refrigerant line damage
Compressor

43. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The contactor coil
The blower relay coil
This will prevent settling of the ground - which can cause refrigerant line damage
Metering device (restrictor)

44. What is the 'are' terminal used for on the thermostat...
Compressor
The power from the transformer
To prevent condensation from forming
The contactor coil

45. When installing a refrigeration line set through a masonry wall
The lines must be covered by PVC to prevent contact with the masonry material
Insulated
Capillary action
Condenser

46. What type of metering device is used on a 12 SEER split air conditioning system...
Evaporator
Condenser
Evaporator
A TXV

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

48. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
The temperature increases
Evaporator
Condenser

49. What is the 'Y' terminal used for on the thermostat...
The cooling contactor coil
A compression fitting
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

50. 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 coil is precharged with nitrogen
The blower relay coil
The accumulator
Refrigerant must be added to the system