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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...
Insulated
Metering device
Condenser
208-volt/240-volt single-phase power supply

2. What is the secondary voltage on a step-down control transformer for a residential furnace...
A TXV
24 volts
Condenser
Compressor

3. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The heating control circuit
The temperature increases
Insulated
The coil is precharged with nitrogen

4. What is the 'are' terminal used for on the thermostat...
The coil is precharged with nitrogen
Must be coiled horizontally and the vapor must flow from top to bottom
The power from the transformer
Have a minimum perimeter of 3' larger than the unit being served

5. 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
Must be located in a conspicuous place to serve as an alarm
Evaporator
This will prevent settling of the ground - which can cause refrigerant line damage

6. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
24 volts
Evaporator
Metering device (restrictor)
Refrigerant must be added to the system

7. Quick-connect fittings are commonly used on...
Have a minimum perimeter of 3' larger than the unit being served
A TXV
Precharged refrigeration linesets
A compression fitting

8. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Evaporator
The receiver
Compressor
The accumulator

9. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Compressor
Evaporator
This will prevent settling of the ground - which can cause refrigerant line damage
Check for tight connections at electrical terminals

10. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
To prevent condensation from forming
The contactor coil
The suction line must be pitched toward the condensing unit
Precharged refrigeration linesets

11. A room thermostat should be mounted...
Near a return-air grill
The suction line must be pitched toward the condensing unit
24 volts
Metering device (restrictor)

12. A secondary drain line...
Evaporator
Precharged refrigeration linesets
Must be located in a conspicuous place to serve as an alarm
A TXV

13. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Near a return-air grill
Insulated
Condenser
Check for tight connections at electrical terminals

14. What is the purpose for insulating a suction line...
To prevent condensation from forming
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The cooling contactor coil
The contactor coil

15. 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 blower relay coil
Metering device (restrictor)
The contactor coil

16. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Capillary action
The lines must be covered by PVC to prevent contact with the masonry material
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

17. What is the 'W' terminal used for on the thermostat...
Check for tight connections at electrical terminals
The blower relay coil
The heating control circuit
The cooling contactor coil

18. What type of fitting uses an O-ring to help seal its joint...
Check for tight connections at electrical terminals
Must be located in a conspicuous place to serve as an alarm
A compression fitting
The coil is precharged with nitrogen

19. 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 receiver
Must be located in a conspicuous place to serve as an alarm
Check for tight connections at electrical terminals

20. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The power from the transformer
Evaporator

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

22. An auxiliary drain pan must...

23. In a sealed system - as the pressure increases...
Evaporator
The temperature increases
Metering device (restrictor)
Condenser

24. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
Condenser
To prevent condensation from forming
Near a return-air grill

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

26. Before energizing a newly installed system - what test should always be done...
Capillary action
Check for tight connections at electrical terminals
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage

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

28. An auxiliary drain pan must...

29. A split-system air conditioning unit has...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The power from the transformer
The blower relay coil
Capillary action

30. A room thermostat should be mounted...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor
Insulated
Near a return-air grill

31. Which part of the system stores refrigerant until it is needed in the evaporator...
Capillary action
The receiver
Condenser
Refrigerant must be added to the system

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

33. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The blower relay coil
Evaporator
The suction line must be pitched toward the condensing unit
Condenser

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

35. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Must be coiled horizontally and the vapor must flow from top to bottom
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system
Check for tight connections at electrical terminals

36. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
208-volt/240-volt single-phase power supply
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom
The temperature increases

37. Residential split-system outdoor condensing units are commonly wired with a...
Condenser
Compressor
208-volt/240-volt single-phase power supply
The receiver

38. Which part of the system prevents liquid from entering the compressor...
Evaporator
The accumulator
The heating control circuit
Insulated

39. Which part of the system stores refrigerant until it is needed in the evaporator...
Check for tight connections at electrical terminals
The receiver
Refrigerant must be added to the system
This will prevent settling of the ground - which can cause refrigerant line damage

40. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Must be coiled horizontally and the vapor must flow from top to bottom
A TXV
Metering device
Evaporator

41. What type of metering device is used on a 12 SEER split air conditioning system...
Refrigerant must be added to the system
Capillary action
A TXV
The accumulator

42. Quick-connect fittings are commonly used on...
Compressor
Precharged refrigeration linesets
Refrigerant must be added to the system
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

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

44. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Have a minimum perimeter of 3' larger than the unit being served
Metering device (restrictor)
A TXV
24 volts

45. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Compressor
The suction line must be pitched toward the condensing unit
A TXV
Evaporator

46. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Condenser
Compressor
The coil is precharged with nitrogen
The blower relay coil

47. Why is it recommended to add a gravel fill under the pad of a condensing unit...
24 volts
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
Condenser

48. 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
24 volts
The contactor coil
Metering device

49. 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
Check for tight connections at electrical terminals
Capillary action
Metering device (restrictor)

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