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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 liquid to a low-pressure liquid...
The lines must be covered by PVC to prevent contact with the masonry material
Metering device (restrictor)
Evaporator
The heating control circuit

2. 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
Evaporator
Must be located in a conspicuous place to serve as an alarm

3. What is the secondary voltage on a step-down control transformer for a residential furnace...
Insulated
24 volts
The contactor coil
The blower relay coil

4. In a sealed system - as the pressure increases...
Condenser
Compressor
The temperature increases
208-volt/240-volt single-phase power supply

5. What type of metering device is used on a 12 SEER split air conditioning system...
The accumulator
A TXV
Capillary action
Condenser

6. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
To prevent condensation from forming
Precharged refrigeration linesets
Near a return-air grill

7. Before energizing a newly installed system - what test should always be done...
Condenser
Metering device
Check for tight connections at electrical terminals
The temperature increases

8. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Insulated
The suction line must be pitched toward the condensing unit
Evaporator
Metering device

9. Which part of the system prevents liquid from entering the compressor...
To prevent condensation from forming
The accumulator
Precharged refrigeration linesets
The blower relay coil

10. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
24 volts
Precharged refrigeration linesets
The blower relay coil

11. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The receiver
This will prevent settling of the ground - which can cause refrigerant line damage
Have a minimum perimeter of 3' larger than the unit being served
The coil is precharged with nitrogen

12. A room thermostat should be mounted...
Near a return-air grill
The receiver
Evaporator
Compressor

13. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Refrigerant must be added to the system
The cooling contactor coil
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material

14. A secondary drain line...
The blower relay coil
The coil is precharged with nitrogen
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm

15. An auxiliary drain pan must...

16. What is the 'W' terminal used for on the thermostat...
A TXV
Must be located in a conspicuous place to serve as an alarm
The heating control circuit
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

17. What type of fitting uses an O-ring to help seal its joint...
Capillary action
208-volt/240-volt single-phase power supply
A compression fitting
The suction line must be pitched toward the condensing unit

18. What is the purpose for insulating a suction line...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
To prevent condensation from forming
Evaporator
The blower relay coil

19. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Capillary action
Condenser
Compressor
The accumulator

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

21. What type of metering device is used on a 12 SEER split air conditioning system...
Condenser
Have a minimum perimeter of 3' larger than the unit being served
A TXV
The blower relay coil

22. Which part of the system stores refrigerant until it is needed in the evaporator...
Evaporator
Evaporator
The receiver
Metering device (restrictor)

23. Which part of the system stores refrigerant until it is needed in the evaporator...
A compression fitting
The receiver
Compressor
Metering device (restrictor)

24. 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
The temperature increases
The blower relay coil

25. Residential split-system outdoor condensing units are commonly wired with a...
A TXV
The temperature increases
208-volt/240-volt single-phase power supply
Insulated

26. What is the secondary voltage on a step-down control transformer for a residential furnace...
Refrigerant must be added to the system
24 volts
This will prevent settling of the ground - which can cause refrigerant line damage
Compressor

27. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Check for tight connections at electrical terminals
To prevent condensation from forming
The blower relay coil
Condenser

28. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
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
The blower relay coil

29. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
24 volts
Refrigerant must be added to the system
A TXV
Compressor

30. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Metering device (restrictor)
This will prevent settling of the ground - which can cause refrigerant line damage
Precharged refrigeration linesets
The temperature increases

31. What is the 'W' terminal used for on the thermostat...
To prevent condensation from forming
Must be located in a conspicuous place to serve as an alarm
Metering device (restrictor)
The heating control circuit

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

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...
The accumulator
A compression fitting
Refrigerant must be added to the system
This will prevent settling of the ground - which can cause refrigerant line damage

34. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The suction line must be pitched toward the condensing unit
The receiver
24 volts
Compressor

35. What is the 'are' terminal used for on the thermostat...
The power from the transformer
Evaporator
The contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom

36. What is the 'are' terminal used for on the thermostat...
Condenser
The power from the transformer
The receiver
Refrigerant must be added to the system

37. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Must be coiled horizontally and the vapor must flow from top to bottom
Must be located in a conspicuous place to serve as an alarm
A compression fitting
Compressor

38. A split-system air conditioning unit has...
Check for tight connections at electrical terminals
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The receiver
Must be coiled horizontally and the vapor must flow from top to bottom

39. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
Condenser
Evaporator
Near a return-air grill

40. Which part of the system prevents liquid from entering the compressor...
24 volts
The accumulator
Check for tight connections at electrical terminals
Evaporator

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

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

43. A secondary drain line...
Must be coiled horizontally and the vapor must flow from top to bottom
The power from the transformer
The blower relay coil
Must be located in a conspicuous place to serve as an alarm

44. A room thermostat should be mounted...
Metering device (restrictor)
The power from the transformer
Check for tight connections at electrical terminals
Near a return-air grill

45. Quick-connect fittings are commonly used on...
The temperature increases
Precharged refrigeration linesets
Check for tight connections at electrical terminals
The suction line must be pitched toward the condensing unit

46. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Check for tight connections at electrical terminals
Evaporator
Capillary action
Metering device

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

48. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The receiver
24 volts
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage

49. A split-system air conditioning unit has...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The suction line must be pitched toward the condensing unit
Metering device (restrictor)
The power from the transformer

50. If ductwork is located in an attic or crawl space - it must be...
The temperature increases
Insulated
Compressor
Have a minimum perimeter of 3' larger than the unit being served