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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 high-pressure liquid to a low-pressure liquid...
Precharged refrigeration linesets
Capillary action
The contactor coil
Metering device (restrictor)

2. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Check for tight connections at electrical terminals
Metering device (restrictor)
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser

3. In a sealed system - as the pressure increases...
The coil is precharged with nitrogen
Evaporator
The power from the transformer
The temperature increases

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

5. 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 coil is precharged with nitrogen
Metering device (restrictor)
Refrigerant must be added to the system
Insulated

6. If ductwork is located in an attic or crawl space - it must be...
The lines must be covered by PVC to prevent contact with the masonry material
The accumulator
Must be located in a conspicuous place to serve as an alarm
Insulated

7. Before energizing a newly installed system - what test should always be done...
The lines must be covered by PVC to prevent contact with the masonry material
Have a minimum perimeter of 3' larger than the unit being served
Check for tight connections at electrical terminals
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

8. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The contactor coil
Metering device (restrictor)
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
208-volt/240-volt single-phase power supply

9. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
208-volt/240-volt single-phase power supply
Compressor
A TXV
Condenser

10. An auxiliary drain pan must...

11. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Must be located in a conspicuous place to serve as an alarm
The power from the transformer
The contactor coil
Capillary action

12. What is the 'G' terminal used for on the thermostat...
The power from the transformer
Have a minimum perimeter of 3' larger than the unit being served
Compressor
The blower relay coil

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

14. A room thermostat should be mounted...
This will prevent settling of the ground - which can cause refrigerant line damage
Must be located in a conspicuous place to serve as an alarm
Near a return-air grill
A compression fitting

15. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The cooling contactor coil
Condenser
Have a minimum perimeter of 3' larger than the unit being served
Metering device (restrictor)

16. A split-system air conditioning unit has...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material
Compressor

17. 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 heating control circuit
The coil is precharged with nitrogen
Condenser

18. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Insulated
Compressor
A TXV
The accumulator

19. What is the purpose for insulating a suction line...
Evaporator
To prevent condensation from forming
Condenser
Metering device

20. In a sealed system - as the pressure increases...
208-volt/240-volt single-phase power supply
The contactor coil
The temperature increases
Evaporator

21. What is the purpose for insulating a suction line...
The accumulator
Metering device (restrictor)
To prevent condensation from forming
Condenser

22. A split-system air conditioning unit has...
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Near a return-air grill
The contactor coil

23. Before energizing a newly installed system - what test should always be done...
Capillary action
Check for tight connections at electrical terminals
Near a return-air grill
A compression fitting

24. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Refrigerant must be added to the system
The blower relay coil
The contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom

25. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The receiver
Check for tight connections at electrical terminals
Evaporator
The power from the transformer

26. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
The accumulator
A TXV
The temperature increases

27. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
Must be located in a conspicuous place to serve as an alarm
208-volt/240-volt single-phase power supply
The coil is precharged with nitrogen

28. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Evaporator
Capillary action
Evaporator
A TXV

29. What type of fitting uses an O-ring to help seal its joint...
Evaporator
The receiver
To prevent condensation from forming
A compression fitting

30. What is the 'W' terminal used for on the thermostat...
Evaporator
Refrigerant must be added to the system
Must be located in a conspicuous place to serve as an alarm
The heating control circuit

31. An auxiliary drain pan must...

32. Residential split-system outdoor condensing units are commonly wired with a...
Metering device
Condenser
208-volt/240-volt single-phase power supply
The accumulator

33. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
The power from the transformer
Compressor
24 volts

34. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Evaporator
To prevent condensation from forming
Must be coiled horizontally and the vapor must flow from top to bottom
Check for tight connections at electrical terminals

35. What is the 'Y' terminal used for on the thermostat...
Condenser
The cooling contactor coil
The contactor coil
The coil is precharged with nitrogen

36. A secondary drain line...
The suction line must be pitched toward the condensing unit
The contactor coil
208-volt/240-volt single-phase power supply
Must be located in a conspicuous place to serve as an alarm

37. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Capillary action
The cooling contactor coil
A compression fitting

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 receiver
The suction line must be pitched toward the condensing unit
Near a return-air grill

39. What is the 'W' terminal used for on the thermostat...
The blower relay coil
Metering device (restrictor)
The heating control circuit
Metering device

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

41. If ductwork is located in an attic or crawl space - it must be...
The power from the transformer
Insulated
A TXV
Evaporator

42. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The cooling contactor coil
The coil is precharged with nitrogen
Have a minimum perimeter of 3' larger than the unit being served
The accumulator

43. 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 contactor coil
The receiver
Evaporator

44. Which part of the system prevents liquid from entering the compressor...
The contactor coil
The accumulator
The coil is precharged with nitrogen
Must be coiled horizontally and the vapor must flow from top to bottom

45. 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
Condenser
Evaporator
Check for tight connections at electrical terminals

46. What is the 'are' terminal used for on the thermostat...
A TXV
Compressor
The power from the transformer
Condenser

47. What is the 'G' terminal used for on the thermostat...
The blower relay coil
Condenser
Capillary action
Precharged refrigeration linesets

48. What is the 'Y' terminal used for on the thermostat...
The cooling contactor coil
A compression fitting
Must be coiled horizontally and the vapor must flow from top to bottom
Check for tight connections at electrical terminals

49. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
The coil is precharged with nitrogen
Compressor
The blower relay coil

50. What is the 'are' terminal used for on the thermostat...
The power from the transformer
The heating control circuit
Capillary action
Condenser