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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. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
This will prevent settling of the ground - which can cause refrigerant line damage
The coil is precharged with nitrogen
24 volts
Condenser

2. An auxiliary drain pan must...

3. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
A TXV
Evaporator
The coil is precharged with nitrogen
The power from the transformer

4. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
This will prevent settling of the ground - which can cause refrigerant line damage
The accumulator
Condenser
To prevent condensation from forming

5. In a sealed system - as the pressure increases...
Metering device
Compressor
The temperature increases
Must be located in a conspicuous place to serve as an alarm

6. Before energizing a newly installed system - what test should always be done...
Must be located in a conspicuous place to serve as an alarm
A compression fitting
Check for tight connections at electrical terminals
Condenser

7. Before energizing a newly installed system - what test should always be done...
The power from the transformer
208-volt/240-volt single-phase power supply
Check for tight connections at electrical terminals
The power from the transformer

8. 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
24 volts
Evaporator
24 volts

9. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The heating control circuit
Evaporator
This will prevent settling of the ground - which can cause refrigerant line damage
The accumulator

10. What is the 'G' terminal used for on the thermostat...
The blower relay coil
The coil is precharged with nitrogen
Precharged refrigeration linesets
Must be coiled horizontally and the vapor must flow from top to bottom

11. Which part of the system stores refrigerant until it is needed in the evaporator...
24 volts
The receiver
Precharged refrigeration linesets
To prevent condensation from forming

12. 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
A TXV
Metering device (restrictor)
Metering device (restrictor)

13. When installing a refrigeration line set through a masonry wall
The temperature increases
Compressor
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

14. A room thermostat should be mounted...
The coil is precharged with nitrogen
Near a return-air grill
208-volt/240-volt single-phase power supply
The contactor coil

15. If ductwork is located in an attic or crawl space - it must be...
Insulated
Capillary action
A TXV
Compressor

16. Residential split-system outdoor condensing units are commonly wired with a...
A compression fitting
Evaporator
208-volt/240-volt single-phase power supply
The blower relay coil

17. An auxiliary drain pan must...

18. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
The coil is precharged with nitrogen
Check for tight connections at electrical terminals

19. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The accumulator
Capillary action
The power from the transformer
The receiver

20. What is the 'Y' terminal used for on the thermostat...
The coil is precharged with nitrogen
The cooling contactor coil
24 volts
Metering device

21. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The cooling contactor coil
The contactor coil
Refrigerant must be added to the system
Near a return-air grill

22. A secondary drain line...
The accumulator
208-volt/240-volt single-phase power supply
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm

23. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
The accumulator
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming

24. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Metering device
Condenser
The accumulator
This will prevent settling of the ground - which can cause refrigerant line damage

25. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Metering device
24 volts
Metering device
Capillary action

26. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The blower relay coil
The suction line must be pitched toward the condensing unit
A TXV
The contactor coil

27. What type of metering device is used on a 12 SEER split air conditioning system...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
A compression fitting
This will prevent settling of the ground - which can cause refrigerant line damage
A TXV

28. Which part of the system prevents liquid from entering the compressor...
Evaporator
The accumulator
The power from the transformer
Insulated

29. Residential split-system outdoor condensing units are commonly wired with a...
Metering device
Precharged refrigeration linesets
The lines must be covered by PVC to prevent contact with the masonry material
208-volt/240-volt single-phase power supply

30. 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 receiver
The temperature increases
Refrigerant must be added to the system
A compression fitting

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

32. What is the secondary voltage on a step-down control transformer for a residential furnace...
The blower relay coil
24 volts
Insulated
Condenser

33. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The receiver
Metering device
Refrigerant must be added to the system
Have a minimum perimeter of 3' larger than the unit being served

34. What type of fitting uses an O-ring to help seal its joint...
The contactor coil
A compression fitting
Metering device
Condenser

35. Which part of the system prevents liquid from entering the compressor...
The accumulator
Near a return-air grill
208-volt/240-volt single-phase power supply
To prevent condensation from forming

36. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The accumulator
Compressor
Refrigerant must be added to the system
Must be located in a conspicuous place to serve as an alarm

37. A secondary drain line...
The coil is precharged with nitrogen
The heating control circuit
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

38. 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
Condenser
Capillary action
208-volt/240-volt single-phase power supply

39. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Condenser
Compressor
Near a return-air grill
The lines must be covered by PVC to prevent contact with the masonry material

40. When installing a refrigeration line set through a masonry wall
The heating control circuit
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
Evaporator

41. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
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

42. If ductwork is located in an attic or crawl space - it must be...
Condenser
The power from the transformer
Insulated
A compression fitting

43. 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
Near a return-air grill
Capillary action
Compressor

44. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Must be coiled horizontally and the vapor must flow from top to bottom
The temperature increases
A TXV

45. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Capillary action
The suction line must be pitched toward the condensing unit
208-volt/240-volt single-phase power supply
The accumulator

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

47. A split-system air conditioning unit has...
This will prevent settling of the ground - which can cause refrigerant line damage
The temperature increases
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The receiver

48. 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
The cooling contactor coil
Metering device (restrictor)
The coil is precharged with nitrogen

49. What is the 'G' terminal used for on the thermostat...
Metering device
Metering device (restrictor)
The blower relay coil
Compressor

50. What is the 'W' terminal used for on the thermostat...
Evaporator
The coil is precharged with nitrogen
The heating control circuit
Condenser