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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 liquid to a low-pressure liquid is the...
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Metering device
Must be located in a conspicuous place to serve as an alarm

2. A room thermostat should be mounted...
Check for tight connections at electrical terminals
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Near a return-air grill
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

3. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
The heating control circuit
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator

4. What is the 'W' terminal used for on the thermostat...
The heating control circuit
A TXV
Compressor
The coil is precharged with nitrogen

5. Which part of the system prevents liquid from entering the compressor...
The accumulator
Check for tight connections at electrical terminals
A TXV
The lines must be covered by PVC to prevent contact with the masonry material

6. 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 suction line must be pitched toward the condensing unit
The heating control circuit
Precharged refrigeration linesets

7. A room thermostat should be mounted...
Evaporator
Capillary action
Near a return-air grill
Compressor

8. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The power from the transformer
Capillary action
Check for tight connections at electrical terminals
The accumulator

9. What is the secondary voltage on a step-down control transformer for a residential furnace...
Must be located in a conspicuous place to serve as an alarm
Evaporator
24 volts
This will prevent settling of the ground - which can cause refrigerant line damage

10. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
A TXV
Condenser
A compression fitting

11. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The suction line must be pitched toward the condensing unit
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom
Precharged refrigeration linesets

12. A split-system air conditioning unit has...
Evaporator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The accumulator
The blower relay coil

13. What is the purpose for insulating a suction line...
A TXV
Must be located in a conspicuous place to serve as an alarm
Capillary action
To prevent condensation from forming

14. What type of metering device is used on a 12 SEER split air conditioning system...
Near a return-air grill
A compression fitting
A TXV
The coil is precharged with nitrogen

15. Which part of the system stores refrigerant until it is needed in the evaporator...
24 volts
A TXV
Near a return-air grill
The receiver

16. Residential split-system outdoor condensing units are commonly wired with a...
Must be located in a conspicuous place to serve as an alarm
The accumulator
The power from the transformer
208-volt/240-volt single-phase power supply

17. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Condenser
Insulated
Metering device
Condenser

18. 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
This will prevent settling of the ground - which can cause refrigerant line damage
Check for tight connections at electrical terminals

19. When installing a refrigeration line set through a masonry wall
The lines must be covered by PVC to prevent contact with the masonry material
208-volt/240-volt single-phase power supply
Check for tight connections at electrical terminals
24 volts

20. What is the 'are' terminal used for on the thermostat...
To prevent condensation from forming
The power from the transformer
The coil is precharged with nitrogen
Compressor

21. 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
Condenser
Evaporator
Compressor

22. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The coil is precharged with nitrogen
24 volts

23. 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
Capillary action
Have a minimum perimeter of 3' larger than the unit being served
Condenser

24. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
A compression fitting
Compressor
The receiver
To prevent condensation from forming

25. An auxiliary drain pan must...

26. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
A compression fitting
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser

27. If ductwork is located in an attic or crawl space - it must be...
Insulated
The receiver
Near a return-air grill
The power from the transformer

28. If ductwork is located in an attic or crawl space - it must be...
A compression fitting
Condenser
The receiver
Insulated

29. In a sealed system - as the pressure increases...
The receiver
The receiver
The temperature increases
The contactor coil

30. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
A TXV
Have a minimum perimeter of 3' larger than the unit being served
Refrigerant must be added to the system

31. Which part of the system stores refrigerant until it is needed in the evaporator...
To prevent condensation from forming
The coil is precharged with nitrogen
Evaporator
The receiver

32. Residential split-system outdoor condensing units are commonly wired with a...
Condenser
The blower relay coil
Near a return-air grill
208-volt/240-volt single-phase power supply

33. What is the 'Y' terminal used for on the thermostat...
Refrigerant must be added to the system
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil
The contactor coil

34. Before energizing a newly installed system - what test should always be done...
Evaporator
Condenser
Check for tight connections at electrical terminals
208-volt/240-volt single-phase power supply

35. Which part of the system prevents liquid from entering the compressor...
Condenser
The accumulator
The contactor coil
Capillary action

36. 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
Condenser

37. Before energizing a newly installed system - what test should always be done...
The power from the transformer
Compressor
208-volt/240-volt single-phase power supply
Check for tight connections at electrical terminals

38. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Precharged refrigeration linesets
Have a minimum perimeter of 3' larger than the unit being served
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser

39. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser
Evaporator
Compressor

40. What is the 'Y' terminal used for on the thermostat...
The lines must be covered by PVC to prevent contact with the masonry material
The contactor coil
To prevent condensation from forming
The cooling contactor coil

41. What is the 'G' terminal used for on the thermostat...
Precharged refrigeration linesets
The blower relay coil
Have a minimum perimeter of 3' larger than the unit being served
Condenser

42. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
24 volts
The temperature increases
The receiver

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...
The suction line must be pitched toward the condensing unit
Must be located in a conspicuous place to serve as an alarm
The temperature increases
Refrigerant must be added to the system

44. What is the secondary voltage on a step-down control transformer for a residential furnace...
Capillary action
24 volts
The temperature increases
Have a minimum perimeter of 3' larger than the unit being served

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

46. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
A TXV
The accumulator
Refrigerant must be added to the system

47. What type of fitting uses an O-ring to help seal its joint...
Must be located in a conspicuous place to serve as an alarm
The heating control circuit
A compression fitting
The cooling contactor coil

48. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The blower relay coil
The power from the transformer
Evaporator
Have a minimum perimeter of 3' larger than the unit being served

49. What is the purpose for insulating a suction line...
A compression fitting
The power from the transformer
The contactor coil
To prevent condensation from forming

50. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The cooling contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The contactor coil
The receiver