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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...
Precharged refrigeration linesets
The coil is precharged with nitrogen
Condenser
Have a minimum perimeter of 3' larger than the unit being served

2. Which part of the system prevents liquid from entering the compressor...
The accumulator
Near a return-air grill
Refrigerant must be added to the system
Compressor

3. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
24 volts
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The coil is precharged with nitrogen
This will prevent settling of the ground - which can cause refrigerant line damage

4. What is the 'are' terminal used for on the thermostat...
208-volt/240-volt single-phase power supply
The power from the transformer
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The cooling contactor coil

5. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
The suction line must be pitched toward the condensing unit
Refrigerant must be added to the system
The cooling contactor coil

6. Quick-connect fittings are commonly used on...
Compressor
Metering device (restrictor)
The power from the transformer
Precharged refrigeration linesets

7. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The blower relay coil
Capillary action
A TXV
Evaporator

8. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The temperature increases
Have a minimum perimeter of 3' larger than the unit being served
Capillary action
Condenser

9. Which part of the system stores refrigerant until it is needed in the evaporator...
208-volt/240-volt single-phase power supply
Check for tight connections at electrical terminals
Evaporator
The receiver

10. In a sealed system - as the pressure increases...
Compressor
Compressor
208-volt/240-volt single-phase power supply
The temperature increases

11. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The power from the transformer
The contactor coil
The blower relay coil
The coil is precharged with nitrogen

12. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
Near a return-air grill
The contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

13. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The contactor coil
Condenser
To prevent condensation from forming
Must be located in a conspicuous place to serve as an alarm

14. What type of fitting uses an O-ring to help seal its joint...
Have a minimum perimeter of 3' larger than the unit being served
A compression fitting
The suction line must be pitched toward the condensing unit
Compressor

15. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The suction line must be pitched toward the condensing unit
Condenser
The coil is precharged with nitrogen
Must be located in a conspicuous place to serve as an alarm

16. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Capillary action
The contactor coil
Evaporator
The suction line must be pitched toward the condensing unit

17. Before energizing a newly installed system - what test should always be done...
A TXV
Condenser
Check for tight connections at electrical terminals
A TXV

18. What is the purpose for insulating a suction line...
Check for tight connections at electrical terminals
A TXV
Refrigerant must be added to the system
To prevent condensation from forming

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

20. When installing a refrigeration line set through a masonry wall
The temperature increases
The lines must be covered by PVC to prevent contact with the masonry material
A TXV
Near a return-air grill

21. An auxiliary drain pan must...

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22. What is the 'W' terminal used for on the thermostat...
The heating control circuit
This will prevent settling of the ground - which can cause refrigerant line damage
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device (restrictor)

23. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The heating control circuit
Compressor
The temperature increases
Must be coiled horizontally and the vapor must flow from top to bottom

24. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Precharged refrigeration linesets
The suction line must be pitched toward the condensing unit
The blower relay coil
Condenser

25. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
The suction line must be pitched toward the condensing unit
A TXV
The power from the transformer

26. When installing a refrigeration line set through a masonry wall
Have a minimum perimeter of 3' larger than the unit being served
Condenser
The lines must be covered by PVC to prevent contact with the masonry material
Capillary action

27. 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
Evaporator
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming

28. 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 power from the transformer
The temperature increases
Refrigerant must be added to the system
Condenser

29. In a sealed system - as the pressure increases...
A compression fitting
Capillary action
The temperature increases
24 volts

30. A room thermostat should be mounted...
Must be coiled horizontally and the vapor must flow from top to bottom
Insulated
Near a return-air grill
Metering device

31. Which part of the system stores refrigerant until it is needed in the evaporator...
Evaporator
Have a minimum perimeter of 3' larger than the unit being served
The receiver
Compressor

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

33. What is the 'are' terminal used for on the thermostat...
Must be located in a conspicuous place to serve as an alarm
Capillary action
The power from the transformer
The temperature increases

34. Before energizing a newly installed system - what test should always be done...
A compression fitting
The cooling contactor coil
Condenser
Check for tight connections at electrical terminals

35. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Condenser
The temperature increases
Insulated

36. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
This will prevent settling of the ground - which can cause refrigerant line damage
This will prevent settling of the ground - which can cause refrigerant line damage
Near a return-air grill

37. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Condenser
The suction line must be pitched toward the condensing unit
Refrigerant must be added to the system
Must be located in a conspicuous place to serve as an alarm

38. What is the secondary voltage on a step-down control transformer for a residential furnace...
Capillary action
24 volts
Capillary action
Check for tight connections at electrical terminals

39. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Compressor
A TXV
Metering device (restrictor)
Capillary action

40. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
24 volts
Near a return-air grill

41. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Metering device (restrictor)
Evaporator
Compressor
Metering device

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

43. A secondary drain line...
Near a return-air grill
Evaporator
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil

44. A room thermostat should be mounted...
Near a return-air grill
The power from the transformer
Capillary action
208-volt/240-volt single-phase power supply

45. A split-system air conditioning unit has...
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
To prevent condensation from forming
To prevent condensation from forming

46. What is the 'G' terminal used for on the thermostat...
The receiver
The blower relay coil
The receiver
Condenser

47. If ductwork is located in an attic or crawl space - it must be...
Insulated
Evaporator
To prevent condensation from forming
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

48. If ductwork is located in an attic or crawl space - it must be...
Compressor
Evaporator
Insulated
Compressor

49. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The blower relay coil
Check for tight connections at electrical terminals
Refrigerant must be added to the system
Must be coiled horizontally and the vapor must flow from top to bottom

50. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The heating control circuit
The suction line must be pitched toward the condensing unit
Capillary action
Evaporator