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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. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Compressor
The accumulator
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser

2. Residential split-system outdoor condensing units are commonly wired with a...
Evaporator
208-volt/240-volt single-phase power supply
The receiver
A TXV

3. 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
Evaporator
The suction line must be pitched toward the condensing unit

4. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Have a minimum perimeter of 3' larger than the unit being served
Condenser
The heating control circuit
Metering device

5. In a sealed system - as the pressure increases...
Compressor
Insulated
The power from the transformer
The temperature increases

6. What is the 'are' terminal used for on the thermostat...
The coil is precharged with nitrogen
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

7. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Metering device
Refrigerant must be added to the system
The coil is precharged with nitrogen
Precharged refrigeration linesets

8. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
The blower relay coil
Near a return-air grill
Evaporator

9. Which part of the system stores refrigerant until it is needed in the evaporator...
Evaporator
The receiver
Refrigerant must be added to the system
To prevent condensation from forming

10. A split-system air conditioning unit has...
The power from the transformer
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
The contactor coil

11. What is the 'Y' terminal used for on the thermostat...
Compressor
The temperature increases
Refrigerant must be added to the system
The cooling contactor coil

12. What is the purpose for insulating a suction line...
The power from the transformer
A TXV
Evaporator
To prevent condensation from forming

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

14. What is the secondary voltage on a step-down control transformer for a residential furnace...
Compressor
24 volts
Evaporator
Precharged refrigeration linesets

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

16. What type of fitting uses an O-ring to help seal its joint...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
To prevent condensation from forming
A compression fitting
Compressor

17. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
A compression fitting
Refrigerant must be added to the system
Insulated
Compressor

18. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
Refrigerant must be added to the system
The receiver
A compression fitting

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

20. What is the 'G' terminal used for on the thermostat...
The blower relay coil
The receiver
The accumulator
Insulated

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

22. A secondary drain line...
Evaporator
Condenser
Insulated
Must be located in a conspicuous place to serve as an alarm

23. A room thermostat should be mounted...
Near a return-air grill
The cooling contactor coil
A compression fitting
Refrigerant must be added to the system

24. Which part of the system prevents liquid from entering the compressor...
The accumulator
The power from the transformer
The coil is precharged with nitrogen
Insulated

25. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Evaporator
The contactor coil
The power from the transformer
The blower relay coil

26. A room thermostat should be mounted...
Refrigerant must be added to the system
The heating control circuit
Near a return-air grill
Condenser

27. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Near a return-air grill
Condenser
The suction line must be pitched toward the condensing unit
Compressor

28. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The suction line must be pitched toward the condensing unit
Evaporator
The blower relay coil
Refrigerant must be added to the system

29. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Evaporator
Metering device
Must be located in a conspicuous place to serve as an alarm
Must be coiled horizontally and the vapor must flow from top to bottom

30. What is the purpose for insulating a suction line...
To prevent condensation from forming
A TXV
Must be located in a conspicuous place to serve as an alarm
Condenser

31. What type of metering device is used on a 12 SEER split air conditioning system...
Insulated
Compressor
A TXV
Precharged refrigeration linesets

32. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Metering device
Evaporator
Check for tight connections at electrical terminals
Metering device (restrictor)

33. What type of fitting uses an O-ring to help seal its joint...
208-volt/240-volt single-phase power supply
A compression fitting
Insulated
The coil is precharged with nitrogen

34. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Insulated
The contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom
Compressor

35. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
24 volts
The suction line must be pitched toward the condensing unit
Capillary action
Must be coiled horizontally and the vapor must flow from top to bottom

36. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The accumulator
24 volts
The lines must be covered by PVC to prevent contact with the masonry material
The suction line must be pitched toward the condensing unit

37. Residential split-system outdoor condensing units are commonly wired with a...
24 volts
Metering device
208-volt/240-volt single-phase power supply
The accumulator

38. A secondary drain line...
Have a minimum perimeter of 3' larger than the unit being served
Must be located in a conspicuous place to serve as an alarm
The contactor coil
The coil is precharged with nitrogen

39. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Capillary action
Metering device (restrictor)
Compressor
208-volt/240-volt single-phase power supply

40. To ensure proper oil return to the compressor - when installing a refrigeration line set...
A compression fitting
The heating control circuit
The suction line must be pitched toward the condensing unit
Evaporator

41. If ductwork is located in an attic or crawl space - it must be...
Metering device
Insulated
208-volt/240-volt single-phase power supply
The receiver

42. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Condenser
The power from the transformer
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device (restrictor)

43. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
The power from the transformer
24 volts
The coil is precharged with nitrogen

44. In a sealed system - as the pressure increases...
The contactor coil
24 volts
The receiver
The temperature increases

45. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device
The coil is precharged with nitrogen
The lines must be covered by PVC to prevent contact with the masonry material
Metering device (restrictor)

46. What is the secondary voltage on a step-down control transformer for a residential furnace...
The blower relay coil
The suction line must be pitched toward the condensing unit
24 volts
A compression fitting

47. Which part of the system prevents liquid from entering the compressor...
To prevent condensation from forming
Check for tight connections at electrical terminals
Metering device (restrictor)
The accumulator

48. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil
Condenser
Capillary action

49. Quick-connect fittings are commonly used on...
This will prevent settling of the ground - which can cause refrigerant line damage
The receiver
Check for tight connections at electrical terminals
Precharged refrigeration linesets

50. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Metering device
The suction line must be pitched toward the condensing unit
Insulated
Compressor