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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 low-pressure liquid to a low-pressure gas...
Capillary action
The accumulator
Evaporator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

2. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
The receiver
24 volts
Must be located in a conspicuous place to serve as an alarm

3. What is the purpose for insulating a suction line...
Condenser
To prevent condensation from forming
Compressor
The accumulator

4. What is the 'G' terminal used for on the thermostat...
The blower relay coil
The power from the transformer
Metering device (restrictor)
Must be coiled horizontally and the vapor must flow from top to bottom

5. An auxiliary drain pan must...

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6. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
Check for tight connections at electrical terminals
The temperature increases
Capillary action

7. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Condenser
208-volt/240-volt single-phase power supply
Compressor
The accumulator

8. A secondary drain line...
Condenser
Evaporator
Must be located in a conspicuous place to serve as an alarm
The temperature increases

9. When installing a refrigeration line set through a masonry wall
208-volt/240-volt single-phase power supply
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage
The lines must be covered by PVC to prevent contact with the masonry material

10. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Check for tight connections at electrical terminals
The coil is precharged with nitrogen
Check for tight connections at electrical terminals

11. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The heating control circuit
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
Condenser

12. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The receiver
The contactor coil
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage

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

14. What is the 'are' terminal used for on the thermostat...
The power from the transformer
Refrigerant must be added to the system
The accumulator
Evaporator

15. 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
Compressor
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom

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

17. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
208-volt/240-volt single-phase power supply
Must be coiled horizontally and the vapor must flow from top to bottom
A compression fitting
Must be located in a conspicuous place to serve as an alarm

18. Before energizing a newly installed system - what test should always be done...
24 volts
Evaporator
Check for tight connections at electrical terminals
Near a return-air grill

19. A room thermostat should be mounted...
Must be coiled horizontally and the vapor must flow from top to bottom
Near a return-air grill
To prevent condensation from forming
A compression fitting

20. 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
24 volts
Evaporator
The contactor coil

21. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Insulated
Near a return-air grill
Metering device (restrictor)
Condenser

22. What is the 'G' terminal used for on the thermostat...
The blower relay coil
The power from the transformer
This will prevent settling of the ground - which can cause refrigerant line damage
Check for tight connections at electrical terminals

23. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Must be located in a conspicuous place to serve as an alarm
Metering device (restrictor)
Near a return-air grill

24. Residential split-system outdoor condensing units are commonly wired with a...
Condenser
The suction line must be pitched toward the condensing unit
Capillary action
208-volt/240-volt single-phase power supply

25. What type of metering device is used on a 12 SEER split air conditioning system...
A compression fitting
Evaporator
The suction line must be pitched toward the condensing unit
A TXV

26. In a sealed system - as the pressure increases...
The temperature increases
Condenser
Have a minimum perimeter of 3' larger than the unit being served
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

27. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Evaporator
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

28. If ductwork is located in an attic or crawl space - it must be...
Insulated
Metering device (restrictor)
Condenser
The heating control circuit

29. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Metering device
Insulated
The blower relay coil

30. Which part of the system stores refrigerant until it is needed in the evaporator...
Metering device (restrictor)
The receiver
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom

31. What is the 'W' terminal used for on the thermostat...
The heating control circuit
Capillary action
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The temperature increases

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

33. In a sealed system - as the pressure increases...
Check for tight connections at electrical terminals
Precharged refrigeration linesets
The temperature increases
Evaporator

34. What is the 'Y' terminal used for on the thermostat...
Capillary action
The cooling contactor coil
Must be located in a conspicuous place to serve as an alarm
Evaporator

35. A room thermostat should be mounted...
Evaporator
Refrigerant must be added to the system
The suction line must be pitched toward the condensing unit
Near a return-air grill

36. What is the purpose for insulating a suction line...
Precharged refrigeration linesets
The coil is precharged with nitrogen
To prevent condensation from forming
Metering device

37. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Refrigerant must be added to the system
A TXV
This will prevent settling of the ground - which can cause refrigerant line damage
The cooling contactor coil

38. When installing a refrigeration line set through a masonry wall
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
Compressor
Have a minimum perimeter of 3' larger than the unit being served

39. What type of fitting uses an O-ring to help seal its joint...
Evaporator
A compression fitting
The cooling contactor coil
Condenser

40. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The suction line must be pitched toward the condensing unit
Check for tight connections at electrical terminals
Metering device (restrictor)
The accumulator

41. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Condenser
Precharged refrigeration linesets
The suction line must be pitched toward the condensing unit
The cooling contactor coil

42. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Have a minimum perimeter of 3' larger than the unit being served
Capillary action
Must be located in a conspicuous place to serve as an alarm
Condenser

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

44. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
208-volt/240-volt single-phase power supply
Evaporator
A compression fitting
Insulated

45. What type of metering device is used on a 12 SEER split air conditioning system...
Condenser
A TXV
Insulated
The power from the transformer

46. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Metering device
The heating control circuit
The contactor coil
Capillary action

47. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Compressor
The accumulator
The cooling contactor coil
The coil is precharged with nitrogen

48. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Check for tight connections at electrical terminals
Must be located in a conspicuous place to serve as an alarm
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom

49. 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
Capillary action
Precharged refrigeration linesets

50. 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
The power from the transformer
Refrigerant must be added to the system
The lines must be covered by PVC to prevent contact with the masonry material