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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. What is the secondary voltage on a step-down control transformer for a residential furnace...
Compressor
Compressor
Capillary action
24 volts

2. What is the purpose for insulating a suction line...
The contactor coil
Check for tight connections at electrical terminals
To prevent condensation from forming
Compressor

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

4. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
208-volt/240-volt single-phase power supply
Capillary action
Must be coiled horizontally and the vapor must flow from top to bottom
Check for tight connections at electrical terminals

5. A split-system air conditioning unit has...
24 volts
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The power from the transformer
Must be located in a conspicuous place to serve as an alarm

6. Which part of the system prevents liquid from entering the compressor...
The accumulator
To prevent condensation from forming
Have a minimum perimeter of 3' larger than the unit being served
Precharged refrigeration linesets

7. What type of fitting uses an O-ring to help seal its joint...
Capillary action
Precharged refrigeration linesets
Evaporator
A compression fitting

8. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
A TXV
Evaporator
Compressor
The lines must be covered by PVC to prevent contact with the masonry material

9. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Metering device
Check for tight connections at electrical terminals
The blower relay coil
Condenser

10. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor
The blower relay coil
The power from the transformer

11. What is the 'are' terminal used for on the thermostat...
24 volts
The suction line must be pitched toward the condensing unit
The power from the transformer
A compression fitting

12. What is the 'Y' terminal used for on the thermostat...
Have a minimum perimeter of 3' larger than the unit being served
The cooling contactor coil
The receiver
The blower relay coil

13. What is the 'G' terminal used for on the thermostat...
To prevent condensation from forming
The blower relay coil
A compression fitting
The heating control circuit

14. What type of fitting uses an O-ring to help seal its joint...
The lines must be covered by PVC to prevent contact with the masonry material
The accumulator
Check for tight connections at electrical terminals
A compression fitting

15. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The temperature increases
A TXV
Evaporator
Condenser

16. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The temperature increases
The suction line must be pitched toward the condensing unit
A TXV
Must be located in a conspicuous place to serve as an alarm

17. What is the purpose for insulating a suction line...
A compression fitting
To prevent condensation from forming
The suction line must be pitched toward the condensing unit
Near a return-air grill

18. What is the 'Y' terminal used for on the thermostat...
The power from the transformer
The cooling contactor coil
208-volt/240-volt single-phase power supply
Metering device

19. An auxiliary drain pan must...

20. In a sealed system - as the pressure increases...
The heating control circuit
Near a return-air grill
Metering device (restrictor)
The temperature increases

21. 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 coil is precharged with nitrogen
The blower relay coil
The accumulator

22. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The coil is precharged with nitrogen
Metering device (restrictor)
A compression fitting
Condenser

23. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Metering device
Precharged refrigeration linesets
24 volts
Compressor

24. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Must be located in a conspicuous place to serve as an alarm
Precharged refrigeration linesets
The power from the transformer
Condenser

25. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Precharged refrigeration linesets
Refrigerant must be added to the system
The temperature increases
A compression fitting

26. Which part of the system prevents liquid from entering the compressor...
Evaporator
The power from the transformer
The accumulator
Must be coiled horizontally and the vapor must flow from top to bottom

27. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
Capillary action
The heating control circuit
The accumulator

28. What type of metering device is used on a 12 SEER split air conditioning system...
The temperature increases
Precharged refrigeration linesets
A TXV
Condenser

29. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
Have a minimum perimeter of 3' larger than the unit being served
Capillary action
Must be coiled horizontally and the vapor must flow from top to bottom

30. What is the 'are' terminal used for on the thermostat...
208-volt/240-volt single-phase power supply
Condenser
The cooling contactor coil
The power from the transformer

31. What is the secondary voltage on a step-down control transformer for a residential furnace...
Compressor
The blower relay coil
A compression fitting
24 volts

32. What type of metering device is used on a 12 SEER split air conditioning system...
The accumulator
A TXV
Evaporator
The heating control circuit

33. A split-system air conditioning unit has...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The cooling contactor coil
A compression fitting
The lines must be covered by PVC to prevent contact with the masonry material

34. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
The blower relay coil
Condenser
The suction line must be pitched toward the condensing unit

35. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Near a return-air grill
Metering device
This will prevent settling of the ground - which can cause refrigerant line damage
A compression fitting

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

37. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Check for tight connections at electrical terminals
Evaporator
Capillary action
Compressor

38. A room thermostat should be mounted...
Compressor
Metering device
Near a return-air grill
208-volt/240-volt single-phase power supply

39. If ductwork is located in an attic or crawl space - it must be...
Must be coiled horizontally and the vapor must flow from top to bottom
Insulated
A compression fitting
Compressor

40. 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 temperature increases
The receiver
Metering device (restrictor)

41. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Must be located in a conspicuous place to serve as an alarm
The accumulator
This will prevent settling of the ground - which can cause refrigerant line damage
Precharged refrigeration linesets

42. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The accumulator
Metering device
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The blower relay coil

43. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Condenser
The receiver
The contactor coil
The accumulator

44. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
To prevent condensation from forming
24 volts
The temperature increases

45. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
Near a return-air grill
Evaporator
Check for tight connections at electrical terminals

46. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
24 volts
Capillary action
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Near a return-air grill

47. 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
Evaporator
The receiver

48. 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
The coil is precharged with nitrogen
The receiver
Refrigerant must be added to the system

49. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
24 volts
Compressor
The accumulator

50. A room thermostat should be mounted...
Near a return-air grill
Precharged refrigeration linesets
Condenser
Metering device