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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 low-pressure liquid to a low-pressure gas is the...
Have a minimum perimeter of 3' larger than the unit being served
Evaporator
Metering device
Compressor

2. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Near a return-air grill
A compression fitting
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom

3. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Metering device
Refrigerant must be added to the system
Compressor

4. What is the purpose for insulating a suction line...
Compressor
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
To prevent condensation from forming
Refrigerant must be added to the system

5. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
24 volts
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser
Metering device (restrictor)

6. A room thermostat should be mounted...
The blower relay coil
Near a return-air grill
Insulated
Evaporator

7. Residential split-system outdoor condensing units are commonly wired with a...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The suction line must be pitched toward the condensing unit
A compression fitting
208-volt/240-volt single-phase power supply

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

9. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Precharged refrigeration linesets
The suction line must be pitched toward the condensing unit
24 volts

10. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage
The blower relay coil

11. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
24 volts
Have a minimum perimeter of 3' larger than the unit being served
The power from the transformer
The contactor coil

12. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The coil is precharged with nitrogen
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser
The heating control circuit

13. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Refrigerant must be added to the system
Have a minimum perimeter of 3' larger than the unit being served
208-volt/240-volt single-phase power supply
Compressor

14. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The cooling contactor coil
Metering device
Compressor
24 volts

15. What is the 'G' terminal used for on the thermostat...
Condenser
The blower relay coil
To prevent condensation from forming
Condenser

16. 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
Check for tight connections at electrical terminals
The contactor coil

17. A split-system air conditioning unit has...
A TXV
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The receiver
24 volts

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

19. If ductwork is located in an attic or crawl space - it must be...
Refrigerant must be added to the system
Insulated
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Precharged refrigeration linesets

20. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Check for tight connections at electrical terminals
Metering device
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The power from the transformer

21. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
24 volts
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
Metering device (restrictor)

22. 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
The suction line must be pitched toward the condensing unit
Compressor
Must be located in a conspicuous place to serve as an alarm

23. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Evaporator
The temperature increases
The accumulator
Capillary action

24. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
Capillary action
Compressor
The heating control circuit

25. In a sealed system - as the pressure increases...
The temperature increases
Must be located in a conspicuous place to serve as an alarm
24 volts
208-volt/240-volt single-phase power supply

26. When installing a refrigeration line set through a masonry wall
Check for tight connections at electrical terminals
Precharged refrigeration linesets
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material

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

28. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
A compression fitting
Condenser
Evaporator
The receiver

29. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
Precharged refrigeration linesets
A compression fitting
The accumulator

30. When installing a refrigeration line set through a masonry wall
Metering device (restrictor)
The lines must be covered by PVC to prevent contact with the masonry material
The coil is precharged with nitrogen
To prevent condensation from forming

31. Quick-connect fittings are commonly used on...
Must be located in a conspicuous place to serve as an alarm
Precharged refrigeration linesets
Refrigerant must be added to the system
A TXV

32. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
A compression fitting
The coil is precharged with nitrogen
The power from the transformer
Evaporator

33. What is the 'W' terminal used for on the thermostat...
Condenser
The heating control circuit
The power from the transformer
Metering device

34. If ductwork is located in an attic or crawl space - it must be...
The power from the transformer
Insulated
The cooling contactor coil
The temperature increases

35. A secondary drain line...
The cooling contactor coil
The suction line must be pitched toward the condensing unit
Insulated
Must be located in a conspicuous place to serve as an alarm

36. Why is it recommended to add a gravel fill under the pad of a condensing unit...
This will prevent settling of the ground - which can cause refrigerant line damage
The blower relay coil
Have a minimum perimeter of 3' larger than the unit being served
Metering device (restrictor)

37. What is the 'are' terminal used for on the thermostat...
Condenser
The power from the transformer
Compressor
Refrigerant must be added to the system

38. 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 temperature increases
The lines must be covered by PVC to prevent contact with the masonry material
A TXV
Refrigerant must be added to the system

39. An auxiliary drain pan must...

40. A split-system air conditioning unit has...
The accumulator
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Insulated

41. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Refrigerant must be added to the system
Condenser
Capillary action
Have a minimum perimeter of 3' larger than the unit being served

42. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
The power from the transformer
Must be coiled horizontally and the vapor must flow from top to bottom
The suction line must be pitched toward the condensing unit

43. What is the secondary voltage on a step-down control transformer for a residential furnace...
Precharged refrigeration linesets
Condenser
Condenser
24 volts

44. What is the 'are' terminal used for on the thermostat...
208-volt/240-volt single-phase power supply
The heating control circuit
The power from the transformer
Condenser

45. Residential split-system outdoor condensing units are commonly wired with a...
Near a return-air grill
208-volt/240-volt single-phase power supply
Must be coiled horizontally and the vapor must flow from top to bottom
The coil is precharged with nitrogen

46. In a sealed system - as the pressure increases...
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system
Refrigerant must be added to the system
The temperature increases

47. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
The accumulator
Refrigerant must be added to the system
Metering device (restrictor)

48. What is the 'G' terminal used for on the thermostat...
Condenser
A TXV
To prevent condensation from forming
The blower relay coil

49. 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
Must be located in a conspicuous place to serve as an alarm
A compression fitting

50. A secondary drain line...
The coil is precharged with nitrogen
Metering device
Must be located in a conspicuous place to serve as an alarm
Near a return-air grill