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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 gas to a high-pressure gas...
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser
Compressor

2. What is the 'Y' terminal used for on the thermostat...
To prevent condensation from forming
The cooling contactor coil
Metering device (restrictor)
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

3. 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
The accumulator
The contactor coil
Near a return-air grill

4. What is the 'are' terminal used for on the thermostat...
Compressor
Check for tight connections at electrical terminals
A compression fitting
The power from the transformer

5. A split-system air conditioning unit has...
The power from the transformer
The contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator

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

7. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action
Condenser
The receiver

8. 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
Refrigerant must be added to the system
The blower relay coil
Evaporator

9. In a sealed system - as the pressure increases...
The temperature increases
208-volt/240-volt single-phase power supply
To prevent condensation from forming
Compressor

10. What type of fitting uses an O-ring to help seal its joint...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
A compression fitting
To prevent condensation from forming
The lines must be covered by PVC to prevent contact with the masonry material

11. Which part of the system prevents liquid from entering the compressor...
The heating control circuit
The accumulator
Evaporator
Capillary action

12. Quick-connect fittings are commonly used on...
Must be located in a conspicuous place to serve as an alarm
The blower relay coil
Precharged refrigeration linesets
24 volts

13. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Must be located in a conspicuous place to serve as an alarm
Metering device
Have a minimum perimeter of 3' larger than the unit being served
Condenser

14. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The coil is precharged with nitrogen
Evaporator
Compressor
The contactor coil

15. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
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 cooling contactor coil

16. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Insulated
The blower relay coil
Refrigerant must be added to the system
Metering device (restrictor)

17. Before energizing a newly installed system - what test should always be done...
Near a return-air grill
Check for tight connections at electrical terminals
The contactor coil
The blower relay coil

18. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The heating control circuit
Metering device
A TXV
The contactor coil

19. 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
Near a return-air grill
The accumulator
The receiver

20. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser
The lines must be covered by PVC to prevent contact with the masonry material

21. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device

22. An auxiliary drain pan must...

23. Residential split-system outdoor condensing units are commonly wired with a...
The cooling contactor coil
208-volt/240-volt single-phase power supply
This will prevent settling of the ground - which can cause refrigerant line damage
The receiver

24. When installing a refrigeration line set through a masonry wall
208-volt/240-volt single-phase power supply
Condenser
The heating control circuit
The lines must be covered by PVC to prevent contact with the masonry material

25. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
24 volts
Condenser
A TXV
The receiver

26. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom
This will prevent settling of the ground - which can cause refrigerant line damage
24 volts

27. Before energizing a newly installed system - what test should always be done...
Must be coiled horizontally and the vapor must flow from top to bottom
Precharged refrigeration linesets
Check for tight connections at electrical terminals
Metering device

28. In a sealed system - as the pressure increases...
The temperature increases
The coil is precharged with nitrogen
The accumulator
Condenser

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...
Compressor
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system

30. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
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
The receiver
Evaporator

31. Which part of the system stores refrigerant until it is needed in the evaporator...
Evaporator
Evaporator
Metering device
The receiver

32. What is the 'W' terminal used for on the thermostat...
The heating control circuit
The power from the transformer
Compressor
208-volt/240-volt single-phase power supply

33. If ductwork is located in an attic or crawl space - it must be...
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage
Metering device
Insulated

34. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The temperature increases
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action
The coil is precharged with nitrogen

35. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
Evaporator
Evaporator
Must be located in a conspicuous place to serve as an alarm

36. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser
208-volt/240-volt single-phase power supply
The accumulator

37. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Condenser
The accumulator
Compressor
The suction line must be pitched toward the condensing unit

38. What is the secondary voltage on a step-down control transformer for a residential furnace...
The receiver
24 volts
Condenser
To prevent condensation from forming

39. Residential split-system outdoor condensing units are commonly wired with a...
The blower relay coil
A TXV
208-volt/240-volt single-phase power supply
The cooling contactor coil

40. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
A compression fitting
Capillary action
Evaporator
The coil is precharged with nitrogen

41. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The coil is precharged with nitrogen
Capillary action
Condenser
Compressor

42. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
A compression fitting
Must be located in a conspicuous place to serve as an alarm
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser

43. If ductwork is located in an attic or crawl space - it must be...
Must be located in a conspicuous place to serve as an alarm
Insulated
To prevent condensation from forming
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

44. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Precharged refrigeration linesets
To prevent condensation from forming
Condenser
Compressor

45. An auxiliary drain pan must...

46. A secondary drain line...
Near a return-air grill
Capillary action
208-volt/240-volt single-phase power supply
Must be located in a conspicuous place to serve as an alarm

47. What is the 'W' terminal used for on the thermostat...
The cooling contactor coil
24 volts
The heating control circuit
Compressor

48. 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
Condenser
Compressor
The heating control circuit

49. What type of fitting uses an O-ring to help seal its joint...
Evaporator
The accumulator
Must be coiled horizontally and the vapor must flow from top to bottom
A compression fitting

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