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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...
The blower relay coil
Metering device
Must be coiled horizontally and the vapor must flow from top to bottom
The coil is precharged with nitrogen

2. 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
Near a return-air grill
Refrigerant must be added to the system
Precharged refrigeration linesets

3. A room thermostat should be mounted...
The receiver
Have a minimum perimeter of 3' larger than the unit being served
Near a return-air grill
The receiver

4. Before energizing a newly installed system - what test should always be done...
A TXV
Check for tight connections at electrical terminals
Evaporator
The accumulator

5. Before energizing a newly installed system - what test should always be done...
Precharged refrigeration linesets
Refrigerant must be added to the system
Check for tight connections at electrical terminals
Insulated

6. What is the 'W' terminal used for on the thermostat...
The heating control circuit
Condenser
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage

7. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
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

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

9. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
Must be located in a conspicuous place to serve as an alarm
The contactor coil
Precharged refrigeration linesets

10. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Condenser
The suction line must be pitched toward the condensing unit
The contactor coil
Metering device

11. What is the 'are' terminal used for on the thermostat...
The power from the transformer
Have a minimum perimeter of 3' larger than the unit being served
Capillary action
Metering device (restrictor)

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

13. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The power from the transformer
Condenser
Compressor
Check for tight connections at electrical terminals

14. What type of fitting uses an O-ring to help seal its joint...
Must be coiled horizontally and the vapor must flow from top to bottom
A compression fitting
Precharged refrigeration linesets
Capillary action

15. What is the secondary voltage on a step-down control transformer for a residential furnace...
The cooling contactor coil
Evaporator
208-volt/240-volt single-phase power supply
24 volts

16. When installing a refrigeration line set through a masonry wall
Metering device
The lines must be covered by PVC to prevent contact with the masonry material
Insulated
Must be located in a conspicuous place to serve as an alarm

17. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
The coil is precharged with nitrogen
Have a minimum perimeter of 3' larger than the unit being served
Metering device

18. What is the 'are' terminal used for on the thermostat...
Must be located in a conspicuous place to serve as an alarm
Refrigerant must be added to the system
The power from the transformer
The contactor coil

19. A split-system air conditioning unit has...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The temperature increases
Compressor
Near a return-air grill

20. A room thermostat should be mounted...
Near a return-air grill
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
Evaporator

21. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The accumulator
This will prevent settling of the ground - which can cause refrigerant line damage
Precharged refrigeration linesets
To prevent condensation from forming

22. 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
Refrigerant must be added to the system
The power from the transformer
Capillary action

23. 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
Compressor
Check for tight connections at electrical terminals
A TXV

24. What is the 'G' terminal used for on the thermostat...
Compressor
The cooling contactor coil
The blower relay coil
Evaporator

25. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Check for tight connections at electrical terminals
The temperature increases
Evaporator

26. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Near a return-air grill
Have a minimum perimeter of 3' larger than the unit being served
The suction line must be pitched toward the condensing unit
Metering device

27. What is the purpose for insulating a suction line...
The receiver
The contactor coil
Compressor
To prevent condensation from forming

28. A secondary drain line...
The coil is precharged with nitrogen
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The contactor coil
Must be located in a conspicuous place to serve as an alarm

29. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The receiver
The lines must be covered by PVC to prevent contact with the masonry material
Metering device (restrictor)
Precharged refrigeration linesets

30. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser
Compressor

31. In a sealed system - as the pressure increases...
The temperature increases
Must be located in a conspicuous place to serve as an alarm
A TXV
Condenser

32. Residential split-system outdoor condensing units are commonly wired with a...
Insulated
208-volt/240-volt single-phase power supply
The power from the transformer
The coil is precharged with nitrogen

33. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Compressor
Must be coiled horizontally and the vapor must flow from top to bottom
Compressor
Near a return-air grill

34. 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
208-volt/240-volt single-phase power supply
Condenser

35. Quick-connect fittings are commonly used on...
Have a minimum perimeter of 3' larger than the unit being served
Precharged refrigeration linesets
The lines must be covered by PVC to prevent contact with the masonry material
The heating control circuit

36. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The contactor coil
To prevent condensation from forming
To prevent condensation from forming
Condenser

37. A split-system air conditioning unit has...
Must be coiled horizontally and the vapor must flow from top to bottom
The cooling contactor coil
A compression fitting
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

38. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The power from the transformer
The accumulator
Condenser
The temperature increases

39. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Check for tight connections at electrical terminals
A compression fitting
The contactor coil
24 volts

40. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Check for tight connections at electrical terminals
Condenser
The accumulator
24 volts

41. An auxiliary drain pan must...

42. When installing a refrigeration line set through a masonry wall
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor
Must be located in a conspicuous place to serve as an alarm
The lines must be covered by PVC to prevent contact with the masonry material

43. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Near a return-air grill
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor
To prevent condensation from forming

44. If ductwork is located in an attic or crawl space - it must be...
Insulated
208-volt/240-volt single-phase power supply
The contactor coil
Compressor

45. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
The heating control circuit
This will prevent settling of the ground - which can cause refrigerant line damage
To prevent condensation from forming

46. A secondary drain line...
Refrigerant must be added to the system
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
The contactor coil

47. Which part of the system prevents liquid from entering the compressor...
Evaporator
The accumulator
The receiver
Have a minimum perimeter of 3' larger than the unit being served

48. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Precharged refrigeration linesets
The receiver
The coil is precharged with nitrogen
Evaporator

49. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The receiver
The cooling contactor coil
The temperature increases
Evaporator

50. Which part of the system prevents liquid from entering the compressor...
The accumulator
This will prevent settling of the ground - which can cause refrigerant line damage
Compressor
Evaporator