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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 is the 'W' terminal used for on the thermostat...
The accumulator
Precharged refrigeration linesets
The heating control circuit
A compression fitting

2. Which part of the system prevents liquid from entering the compressor...
Refrigerant must be added to the system
The accumulator
The coil is precharged with nitrogen
Condenser

3. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
To prevent condensation from forming
Metering device (restrictor)
This will prevent settling of the ground - which can cause refrigerant line damage
208-volt/240-volt single-phase power supply

4. What is the purpose for insulating a suction line...
The contactor coil
To prevent condensation from forming
The power from the transformer
The cooling contactor coil

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

6. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The cooling contactor coil
Evaporator
Metering device (restrictor)
Condenser

7. In a sealed system - as the pressure increases...
Precharged refrigeration linesets
The temperature increases
24 volts
The suction line must be pitched toward the condensing unit

8. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The contactor coil
Compressor
The power from the transformer
To prevent condensation from forming

9. If ductwork is located in an attic or crawl space - it must be...
The suction line must be pitched toward the condensing unit
Evaporator
Compressor
Insulated

10. Residential split-system outdoor condensing units are commonly wired with a...
The blower relay coil
208-volt/240-volt single-phase power supply
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Check for tight connections at electrical terminals

11. Before energizing a newly installed system - what test should always be done...
The contactor coil
Check for tight connections at electrical terminals
The lines must be covered by PVC to prevent contact with the masonry material
The heating control circuit

12. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Refrigerant must be added to the system
Metering device
Metering device (restrictor)
Evaporator

13. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Condenser
To prevent condensation from forming
Must be located in a conspicuous place to serve as an alarm

14. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The heating control circuit
Insulated
The temperature increases
Must be coiled horizontally and the vapor must flow from top to bottom

15. What is the 'are' terminal used for on the thermostat...
To prevent condensation from forming
The receiver
Metering device (restrictor)
The power from the transformer

16. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The power from the transformer
24 volts
The contactor coil
A compression fitting

17. What is the 'Y' terminal used for on the thermostat...
The blower relay coil
The cooling contactor coil
A compression fitting
Must be coiled horizontally and the vapor must flow from top to bottom

18. What is the 'Y' terminal used for on the thermostat...
Condenser
The temperature increases
The cooling contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom

19. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm
208-volt/240-volt single-phase power supply
Condenser

20. A room thermostat should be mounted...
The contactor coil
Near a return-air grill
Condenser
The cooling contactor coil

21. When installing a refrigeration line set through a masonry wall
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
Have a minimum perimeter of 3' larger than the unit being served
Precharged refrigeration linesets

22. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Capillary action
Compressor
Check for tight connections at electrical terminals
Metering device

23. A room thermostat should be mounted...
Compressor
Evaporator
Metering device (restrictor)
Near a return-air grill

24. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
A compression fitting
The heating control circuit
The coil is precharged with nitrogen
Evaporator

25. A split-system air conditioning unit has...
Compressor
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The accumulator
The contactor coil

26. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
208-volt/240-volt single-phase power supply
A TXV
The coil is precharged with nitrogen
Precharged refrigeration linesets

27. What is the 'W' terminal used for on the thermostat...
Check for tight connections at electrical terminals
The heating control circuit
The contactor coil
The cooling contactor coil

28. 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
Precharged refrigeration linesets
The cooling contactor coil

29. An auxiliary drain pan must...

30. In a sealed system - as the pressure increases...
A TXV
Near a return-air grill
The temperature increases
Refrigerant must be added to the system

31. What type of fitting uses an O-ring to help seal its joint...
Compressor
A compression fitting
Have a minimum perimeter of 3' larger than the unit being served
The lines must be covered by PVC to prevent contact with the masonry material

32. 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
The suction line must be pitched toward the condensing unit
Must be located in a conspicuous place to serve as an alarm
Condenser

33. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
A compression fitting
The lines must be covered by PVC to prevent contact with the masonry material
Precharged refrigeration linesets

34. 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 coiled horizontally and the vapor must flow from top to bottom
Refrigerant must be added to the system
A compression fitting
Insulated

35. What is the 'are' terminal used for on the thermostat...
To prevent condensation from forming
Check for tight connections at electrical terminals
The power from the transformer
Have a minimum perimeter of 3' larger than the unit being served

36. Residential split-system outdoor condensing units are commonly wired with a...
The accumulator
This will prevent settling of the ground - which can cause refrigerant line damage
208-volt/240-volt single-phase power supply
Must be coiled horizontally and the vapor must flow from top to bottom

37. Which part of the system stores refrigerant until it is needed in the evaporator...
The suction line must be pitched toward the condensing unit
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The receiver

38. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
To prevent condensation from forming
The coil is precharged with nitrogen
Compressor

39. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Capillary action
To prevent condensation from forming
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Metering device (restrictor)

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

41. A split-system air conditioning unit has...
The heating control circuit
The coil is precharged with nitrogen
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
A compression fitting

42. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Compressor
Refrigerant must be added to the system
The receiver

43. What type of metering device is used on a 12 SEER split air conditioning system...
Must be coiled horizontally and the vapor must flow from top to bottom
Capillary action
Compressor
A TXV

44. When installing a refrigeration line set through a masonry wall
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 contactor coil
Metering device

45. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
Condenser
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

46. What is the 'G' terminal used for on the thermostat...
The blower relay coil
Condenser
The receiver
Compressor

47. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The contactor coil
Refrigerant must be added to the system
Compressor
Have a minimum perimeter of 3' larger than the unit being served

48. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Evaporator
A TXV
Must be coiled horizontally and the vapor must flow from top to bottom
The coil is precharged with nitrogen

49. What is the secondary voltage on a step-down control transformer for a residential furnace...
To prevent condensation from forming
Condenser
24 volts
This will prevent settling of the ground - which can cause refrigerant line damage

50. If ductwork is located in an attic or crawl space - it must be...
Insulated
The temperature increases
Compressor
Compressor