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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...
Near a return-air grill
The blower relay coil
Condenser
Capillary action

2. In a sealed system - as the pressure increases...
The cooling contactor coil
The temperature increases
Compressor
Evaporator

3. If ductwork is located in an attic or crawl space - it must be...
Insulated
Capillary action
Refrigerant must be added to the system
Condenser

4. A split-system air conditioning unit has...
Insulated
208-volt/240-volt single-phase power supply
24 volts
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

5. Which part of the system prevents liquid from entering the compressor...
The accumulator
Metering device
Check for tight connections at electrical terminals
Must be coiled horizontally and the vapor must flow from top to bottom

6. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Insulated
Refrigerant must be added to the system
Capillary action

7. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Have a minimum perimeter of 3' larger than the unit being served
Evaporator
Have a minimum perimeter of 3' larger than the unit being served

8. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Condenser
Have a minimum perimeter of 3' larger than the unit being served
Must be coiled horizontally and the vapor must flow from top to bottom
A TXV

9. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
The accumulator
The accumulator
Refrigerant must be added to the system

10. What type of metering device is used on a 12 SEER split air conditioning system...
Compressor
A TXV
Have a minimum perimeter of 3' larger than the unit being served
Metering device (restrictor)

11. Quick-connect fittings are commonly used on...
Near a return-air grill
The receiver
The accumulator
Precharged refrigeration linesets

12. What is the 'W' terminal used for on the thermostat...
The contactor coil
Metering device (restrictor)
The heating control circuit
To prevent condensation from forming

13. A secondary drain line...
Capillary action
Metering device
Must be located in a conspicuous place to serve as an alarm
The accumulator

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

15. When installing a refrigeration line set through a masonry wall
Check for tight connections at electrical terminals
The lines must be covered by PVC to prevent contact with the masonry material
Condenser
The power from the transformer

16. What is the 'G' terminal used for on the thermostat...
The blower relay coil
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage
The suction line must be pitched toward the condensing unit

17. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Capillary action
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

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

19. A split-system air conditioning unit has...
Metering device (restrictor)
Metering device
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser

20. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
The suction line must be pitched toward the condensing unit
Insulated
Refrigerant must be added to the system
The power from the transformer

21. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Near a return-air grill
Compressor
208-volt/240-volt single-phase power supply
Insulated

22. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
Condenser
Refrigerant must be added to the system
The receiver

23. A room thermostat should be mounted...
Evaporator
This will prevent settling of the ground - which can cause refrigerant line damage
Near a return-air grill
The cooling contactor coil

24. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
A compression fitting
Compressor
The blower relay coil

25. A room thermostat should be mounted...
Must be located in a conspicuous place to serve as an alarm
Near a return-air grill
208-volt/240-volt single-phase power supply
A TXV

26. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
208-volt/240-volt single-phase power supply
Near a return-air grill
Compressor
The contactor coil

27. To ensure proper oil return to the compressor - when installing a refrigeration line set...
This will prevent settling of the ground - which can cause refrigerant line damage
The power from the transformer
A compression fitting
The suction line must be pitched toward the condensing unit

28. What is the 'G' terminal used for on the thermostat...
The blower relay coil
Precharged refrigeration linesets
The lines must be covered by PVC to prevent contact with the masonry material
The lines must be covered by PVC to prevent contact with the masonry material

29. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Capillary action
Near a return-air grill
Refrigerant must be added to the system
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

30. When installing a refrigeration line set through a masonry wall
Must be coiled horizontally and the vapor must flow from top to bottom
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The temperature increases
The lines must be covered by PVC to prevent contact with the masonry material

31. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The heating control circuit
The blower relay coil
The contactor coil
Check for tight connections at electrical terminals

32. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Compressor
The coil is precharged with nitrogen
208-volt/240-volt single-phase power supply
The heating control circuit

33. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
A compression fitting
Evaporator
To prevent condensation from forming
The contactor coil

34. What is the 'are' terminal used for on the thermostat...
Have a minimum perimeter of 3' larger than the unit being served
The power from the transformer
Insulated
Evaporator

35. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
A compression fitting
Precharged refrigeration linesets
Have a minimum perimeter of 3' larger than the unit being served

36. Which part of the system stores refrigerant until it is needed in the evaporator...
Compressor
The receiver
208-volt/240-volt single-phase power supply
A TXV

37. An auxiliary drain pan must...

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38. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
A compression fitting
The receiver
Condenser

39. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
To prevent condensation from forming
The coil is precharged with nitrogen
The receiver
Insulated

40. What is the purpose for insulating a suction line...
To prevent condensation from forming
The lines must be covered by PVC to prevent contact with the masonry material
The cooling contactor coil
Condenser

41. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
The heating control circuit
Near a return-air grill
The cooling contactor coil

42. What is the 'Y' terminal used for on the thermostat...
The contactor coil
The cooling contactor coil
Must be located in a conspicuous place to serve as an alarm
24 volts

43. 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
The coil is precharged with nitrogen
The lines must be covered by PVC to prevent contact with the masonry material
The blower relay coil

44. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Metering device (restrictor)
Evaporator
Check for tight connections at electrical terminals
The power from the transformer

45. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The suction line must be pitched toward the condensing unit
The lines must be covered by PVC to prevent contact with the masonry material
The coil is precharged with nitrogen
Evaporator

46. What is the 'are' terminal used for on the thermostat...
Condenser
The power from the transformer
Must be coiled horizontally and the vapor must flow from top to bottom
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

47. What is the secondary voltage on a step-down control transformer for a residential furnace...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
To prevent condensation from forming
24 volts
Precharged refrigeration linesets

48. 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
Evaporator
The accumulator
The power from the transformer

49. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Check for tight connections at electrical terminals
Compressor
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming

50. Which part of the system prevents liquid from entering the compressor...
The cooling contactor coil
The accumulator
The lines must be covered by PVC to prevent contact with the masonry material
Compressor