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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...
Must be located in a conspicuous place to serve as an alarm
Compressor
24 volts
Refrigerant must be added to the system

2. What is the 'G' terminal used for on the thermostat...
The suction line must be pitched toward the condensing unit
Precharged refrigeration linesets
The blower relay coil
Evaporator

3. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The contactor coil
Capillary action
Metering device
The blower relay coil

4. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The suction line must be pitched toward the condensing unit
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action

5. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Must be located in a conspicuous place to serve as an alarm
The coil is precharged with nitrogen
Must be located in a conspicuous place to serve as an alarm
Evaporator

6. Which part of the system stores refrigerant until it is needed in the evaporator...
A compression fitting
The receiver
Compressor
Condenser

7. A secondary drain line...
The contactor coil
Must be located in a conspicuous place to serve as an alarm
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator

8. In a sealed system - as the pressure increases...
Check for tight connections at electrical terminals
The heating control circuit
Metering device
The temperature increases

9. A secondary drain line...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Must be located in a conspicuous place to serve as an alarm
The accumulator
The receiver

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

11. What is the 'Y' terminal used for on the thermostat...
Compressor
The heating control circuit
A compression fitting
The cooling contactor coil

12. 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 blower relay coil
The power from the transformer

13. What type of metering device is used on a 12 SEER split air conditioning system...
Have a minimum perimeter of 3' larger than the unit being served
A TXV
208-volt/240-volt single-phase power supply
The suction line must be pitched toward the condensing unit

14. Which part of the system stores refrigerant until it is needed in the evaporator...
Evaporator
The receiver
Capillary action
The heating control circuit

15. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
To prevent condensation from forming
Refrigerant must be added to the system
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom

16. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The blower relay coil
The suction line must be pitched toward the condensing unit
208-volt/240-volt single-phase power supply
The power from the transformer

17. A room thermostat should be mounted...
Compressor
Near a return-air grill
Must be coiled horizontally and the vapor must flow from top to bottom
Compressor

18. A room thermostat should be mounted...
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system
Evaporator
Near a return-air grill

19. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Insulated
Evaporator
Condenser
The temperature increases

20. Residential split-system outdoor condensing units are commonly wired with a...
Condenser
The heating control circuit
208-volt/240-volt single-phase power supply
The contactor coil

21. Quick-connect fittings are commonly used on...
A TXV
Compressor
Precharged refrigeration linesets
Near a return-air grill

22. What is the secondary voltage on a step-down control transformer for a residential furnace...
To prevent condensation from forming
24 volts
Capillary action
Metering device

23. What is the purpose for insulating a suction line...
The cooling contactor coil
This will prevent settling of the ground - which can cause refrigerant line damage
To prevent condensation from forming
Condenser

24. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor
The coil is precharged with nitrogen
Have a minimum perimeter of 3' larger than the unit being served

25. Which part of the system prevents liquid from entering the compressor...
The accumulator
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action
The blower relay coil

26. What is the 'W' terminal used for on the thermostat...
The lines must be covered by PVC to prevent contact with the masonry material
Capillary action
Condenser
The heating control circuit

27. If ductwork is located in an attic or crawl space - it must be...
The power from the transformer
Insulated
The temperature increases
This will prevent settling of the ground - which can cause refrigerant line damage

28. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Check for tight connections at electrical terminals
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser
The cooling contactor coil

29. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The temperature increases
To prevent condensation from forming
The suction line must be pitched toward the condensing unit
Evaporator

30. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Must be located in a conspicuous place to serve as an alarm
208-volt/240-volt single-phase power supply
The accumulator
Condenser

31. A split-system air conditioning unit has...
To prevent condensation from forming
To prevent condensation from forming
The receiver
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

32. What is the 'Y' terminal used for on the thermostat...
24 volts
The temperature increases
The cooling contactor coil
The contactor coil

33. When installing a refrigeration line set through a masonry wall
Near a return-air grill
The lines must be covered by PVC to prevent contact with the masonry material
The accumulator
Compressor

34. An auxiliary drain pan must...

35. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Insulated
Capillary action
The contactor coil
The heating control circuit

36. What is the 'W' terminal used for on the thermostat...
The coil is precharged with nitrogen
The accumulator
The heating control circuit
The blower relay coil

37. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
Capillary action
Evaporator
The accumulator

38. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The temperature increases
Precharged refrigeration linesets
The coil is precharged with nitrogen
Precharged refrigeration linesets

39. What type of fitting uses an O-ring to help seal its joint...
The lines must be covered by PVC to prevent contact with the masonry material
Compressor
The contactor coil
A compression fitting

40. What is the purpose for insulating a suction line...
To prevent condensation from forming
Capillary action
The suction line must be pitched toward the condensing unit
Condenser

41. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Insulated
24 volts
The temperature increases
Condenser

42. Why is it recommended to add a gravel fill under the pad of a condensing unit...
208-volt/240-volt single-phase power supply
The heating control circuit
This will prevent settling of the ground - which can cause refrigerant line damage
The blower relay coil

43. When installing a refrigeration line set through a masonry wall
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor
The lines must be covered by PVC to prevent contact with the masonry material
Condenser

44. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Capillary action
Evaporator
The cooling contactor coil
Compressor

45. In a sealed system - as the pressure increases...
The temperature increases
The blower relay coil
A TXV
A TXV

46. What is the 'are' terminal used for on the thermostat...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The power from the transformer
Condenser
The cooling contactor coil

47. 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 heating control circuit
Precharged refrigeration linesets
The lines must be covered by PVC to prevent contact with the masonry material

48. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device (restrictor)
Metering device (restrictor)

49. Before energizing a newly installed system - what test should always be done...
Metering device
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
Check for tight connections at electrical terminals

50. What is the 'G' terminal used for on the thermostat...
Near a return-air grill
The blower relay coil
Refrigerant must be added to the system
The cooling contactor coil