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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...
Have a minimum perimeter of 3' larger than the unit being served
Condenser
The cooling contactor coil
Precharged refrigeration linesets

2. What is the purpose for insulating a suction line...
208-volt/240-volt single-phase power supply
To prevent condensation from forming
Compressor
Condenser

3. An auxiliary drain pan must...

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

5. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming
The blower relay coil
Compressor

6. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Metering device (restrictor)
Evaporator
The accumulator

7. A room thermostat should be mounted...
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil
Near a return-air grill
Compressor

8. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The cooling contactor coil
Insulated
The power from the transformer
Evaporator

9. 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
To prevent condensation from forming
The heating control circuit

10. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device
Have a minimum perimeter of 3' larger than the unit being served
The contactor coil

11. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Capillary action
The contactor coil
A compression fitting
Evaporator

12. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
The suction line must be pitched toward the condensing unit
208-volt/240-volt single-phase power supply
Precharged refrigeration linesets

13. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The contactor coil
The heating control circuit
The suction line must be pitched toward the condensing unit
Refrigerant must be added to the system

14. What type of fitting uses an O-ring to help seal its joint...
This will prevent settling of the ground - which can cause refrigerant line damage
The heating control circuit
The lines must be covered by PVC to prevent contact with the masonry material
A compression fitting

15. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Compressor
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser

16. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Capillary action
The heating control circuit
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

17. What is the 'Y' terminal used for on the thermostat...
To prevent condensation from forming
Refrigerant must be added to the system
Metering device (restrictor)
The cooling contactor coil

18. What type of fitting uses an O-ring to help seal its joint...
The receiver
A compression fitting
The heating control circuit
Must be located in a conspicuous place to serve as an alarm

19. When installing a refrigeration line set through a masonry wall
Refrigerant must be added to the system
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser
The lines must be covered by PVC to prevent contact with the masonry material

20. A room thermostat should be mounted...
Precharged refrigeration linesets
Insulated
This will prevent settling of the ground - which can cause refrigerant line damage
Near a return-air grill

21. Before energizing a newly installed system - what test should always be done...
Condenser
Metering device (restrictor)
A TXV
Check for tight connections at electrical terminals

22. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage

23. Which part of the system stores refrigerant until it is needed in the evaporator...
The accumulator
Metering device
The receiver
Insulated

24. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The suction line must be pitched toward the condensing unit
The coil is precharged with nitrogen
Have a minimum perimeter of 3' larger than the unit being served
Compressor

25. If ductwork is located in an attic or crawl space - it must be...
The heating control circuit
Insulated
Evaporator
The suction line must be pitched toward the condensing unit

26. A secondary drain line...
The temperature increases
The receiver
Must be located in a conspicuous place to serve as an alarm
The suction line must be pitched toward the condensing unit

27. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Must be located in a conspicuous place to serve as an alarm
Near a return-air grill
Compressor
The coil is precharged with nitrogen

28. Residential split-system outdoor condensing units are commonly wired with a...
Compressor
208-volt/240-volt single-phase power supply
Check for tight connections at electrical terminals
A compression fitting

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...
Refrigerant must be added to the system
24 volts
This will prevent settling of the ground - which can cause refrigerant line damage
Have a minimum perimeter of 3' larger than the unit being served

30. 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
The cooling contactor coil
Insulated

31. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
Insulated
The contactor coil
The coil is precharged with nitrogen

32. Quick-connect fittings are commonly used on...
The heating control circuit
This will prevent settling of the ground - which can cause refrigerant line damage
The blower relay coil
Precharged refrigeration linesets

33. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
24 volts
To prevent condensation from forming
A compression fitting
Condenser

34. If ductwork is located in an attic or crawl space - it must be...
Evaporator
Insulated
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom

35. Which part of the system stores refrigerant until it is needed in the evaporator...
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming
The receiver
The contactor coil

36. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Precharged refrigeration linesets
Metering device
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

37. What is the 'G' terminal used for on the thermostat...
The coil is precharged with nitrogen
The blower relay coil
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system

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
The power from the transformer
Have a minimum perimeter of 3' larger than the unit being served
The temperature increases

39. 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
The heating control circuit
A compression fitting
The accumulator

40. To ensure proper oil return to the compressor - when installing a refrigeration line set...
24 volts
The suction line must be pitched toward the condensing unit
The temperature increases
Refrigerant must be added to the system

41. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
A compression fitting
The blower relay coil
Capillary action
Have a minimum perimeter of 3' larger than the unit being served

42. A secondary drain line...
Compressor
Must be located in a conspicuous place to serve as an alarm
The blower relay coil
Insulated

43. What is the 'W' terminal used for on the thermostat...
The temperature increases
The heating control circuit
24 volts
A compression fitting

44. What is the 'are' terminal used for on the thermostat...
24 volts
The heating control circuit
The power from the transformer
The accumulator

45. What is the purpose for insulating a suction line...
A compression fitting
To prevent condensation from forming
Refrigerant must be added to the system
The receiver

46. What is the 'G' terminal used for on the thermostat...
The suction line must be pitched toward the condensing unit
The contactor coil
Precharged refrigeration linesets
The blower relay coil

47. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Have a minimum perimeter of 3' larger than the unit being served
208-volt/240-volt single-phase power supply
Capillary action

48. Residential split-system outdoor condensing units are commonly wired with a...
Have a minimum perimeter of 3' larger than the unit being served
24 volts
208-volt/240-volt single-phase power supply
The suction line must be pitched toward the condensing unit

49. Which part of the system prevents liquid from entering the compressor...
Metering device (restrictor)
208-volt/240-volt single-phase power supply
The suction line must be pitched toward the condensing unit
The accumulator

50. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
This will prevent settling of the ground - which can cause refrigerant line damage
Check for tight connections at electrical terminals
A TXV