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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 compressor and condenser connected by a refrigeration line set to the metering device and evaporator
208-volt/240-volt single-phase power supply
The heating control circuit
The blower relay coil

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

3. What is the purpose for insulating a suction line...
To prevent condensation from forming
Must be located in a conspicuous place to serve as an alarm
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The cooling contactor coil

4. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Near a return-air grill
Precharged refrigeration linesets
The receiver
Evaporator

5. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator
The cooling contactor coil
Compressor

6. If ductwork is located in an attic or crawl space - it must be...
To prevent condensation from forming
Precharged refrigeration linesets
Refrigerant must be added to the system
Insulated

7. A secondary drain line...
Have a minimum perimeter of 3' larger than the unit being served
The power from the transformer
The heating control circuit
Must be located in a conspicuous place to serve as an alarm

8. Which part of the system prevents liquid from entering the compressor...
Refrigerant must be added to the system
The contactor coil
The receiver
The accumulator

9. Residential split-system outdoor condensing units are commonly wired with a...
Must be coiled horizontally and the vapor must flow from top to bottom
Check for tight connections at electrical terminals
Near a return-air grill
208-volt/240-volt single-phase power supply

10. 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
To prevent condensation from forming
Must be located in a conspicuous place to serve as an alarm

11. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The receiver
Compressor
Have a minimum perimeter of 3' larger than the unit being served
Evaporator

12. What is the 'are' terminal used for on the thermostat...
The lines must be covered by PVC to prevent contact with the masonry material
24 volts
The power from the transformer
208-volt/240-volt single-phase power supply

13. What is the purpose for insulating a suction line...
Condenser
The blower relay coil
Condenser
To prevent condensation from forming

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

15. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The lines must be covered by PVC to prevent contact with the masonry material
Precharged refrigeration linesets
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device

16. What type of fitting uses an O-ring to help seal its joint...
Compressor
Condenser
Precharged refrigeration linesets
A compression fitting

17. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Insulated
The contactor coil
Condenser
Precharged refrigeration linesets

18. To ensure proper oil return to the compressor - when installing a refrigeration line set...
208-volt/240-volt single-phase power supply
The receiver
The heating control circuit
The suction line must be pitched toward the condensing unit

19. 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
The heating control circuit
A compression fitting

20. A room thermostat should be mounted...
The accumulator
Evaporator
24 volts
Near a return-air grill

21. Residential split-system outdoor condensing units are commonly wired with a...
This will prevent settling of the ground - which can cause refrigerant line damage
208-volt/240-volt single-phase power supply
Capillary action
Metering device

22. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
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
Must be located in a conspicuous place to serve as an alarm

23. What is the secondary voltage on a step-down control transformer for a residential furnace...
The cooling contactor coil
24 volts
Must be coiled horizontally and the vapor must flow from top to bottom
208-volt/240-volt single-phase power supply

24. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
A TXV
Evaporator
The power from the transformer

25. If ductwork is located in an attic or crawl space - it must be...
Near a return-air grill
Insulated
Must be coiled horizontally and the vapor must flow from top to bottom
The power from the transformer

26. 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
Precharged refrigeration linesets
The accumulator
Evaporator

27. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Must be located in a conspicuous place to serve as an alarm
Evaporator
Refrigerant must be added to the system

28. What type of metering device is used on a 12 SEER split air conditioning system...
Compressor
The contactor coil
A TXV
The receiver

29. What is the 'Y' terminal used for on the thermostat...
The cooling contactor coil
A TXV
The heating control circuit
24 volts

30. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Condenser
Near a return-air grill
The suction line must be pitched toward the condensing unit
Refrigerant must be added to the system

31. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
Evaporator
Must be located in a conspicuous place to serve as an alarm
Refrigerant must be added to the system

32. An auxiliary drain pan must...

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33. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The suction line must be pitched toward the condensing unit
The suction line must be pitched toward the condensing unit
The cooling contactor coil
Capillary action

34. 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
This will prevent settling of the ground - which can cause refrigerant line damage
A TXV
Metering device

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

36. A secondary drain line...
Compressor
To prevent condensation from forming
The power from the transformer
Must be located in a conspicuous place to serve as an alarm

37. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Compressor
To prevent condensation from forming
Must be coiled horizontally and the vapor must flow from top to bottom
Evaporator

38. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
A compression fitting
The temperature increases
Refrigerant must be added to the system
The contactor coil

39. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
Compressor
Condenser
The power from the transformer

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

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

42. Which part of the system prevents liquid from entering the compressor...
A compression fitting
The accumulator
Refrigerant must be added to the system
The blower relay coil

43. Quick-connect fittings are commonly used on...
208-volt/240-volt single-phase power supply
The power from the transformer
208-volt/240-volt single-phase power supply
Precharged refrigeration linesets

44. What type of metering device is used on a 12 SEER split air conditioning system...
The blower relay coil
A TXV
Condenser
The lines must be covered by PVC to prevent contact with the masonry material

45. What is the 'G' terminal used for on the thermostat...
The blower relay coil
The coil is precharged with nitrogen
The contactor coil
208-volt/240-volt single-phase power supply

46. What type of fitting uses an O-ring to help seal its joint...
Precharged refrigeration linesets
Insulated
The suction line must be pitched toward the condensing unit
A compression fitting

47. In a sealed system - as the pressure increases...
The temperature increases
A TXV
To prevent condensation from forming
The power from the transformer

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

49. A split-system air conditioning unit has...
Must be located in a conspicuous place to serve as an alarm
24 volts
A TXV
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

50. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Capillary action
The temperature increases
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser