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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. What is the purpose for insulating a suction line...
Condenser
To prevent condensation from forming
Insulated
A TXV

2. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
To prevent condensation from forming
The temperature increases
Evaporator
Metering device

3. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Capillary action
Must be coiled horizontally and the vapor must flow from top to bottom
208-volt/240-volt single-phase power supply
This will prevent settling of the ground - which can cause refrigerant line damage

4. A room thermostat should be mounted...
Near a return-air grill
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser
The suction line must be pitched toward the condensing unit

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...
Must be located in a conspicuous place to serve as an alarm
The temperature increases
Compressor
Refrigerant must be added to the system

6. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Precharged refrigeration linesets
Metering device (restrictor)

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

8. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
To prevent condensation from forming
Evaporator
The blower relay coil
Condenser

9. What type of metering device is used on a 12 SEER split air conditioning system...
Near a return-air grill
The lines must be covered by PVC to prevent contact with the masonry material
A TXV
Compressor

10. 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
24 volts
The temperature increases
Must be located in a conspicuous place to serve as an alarm

11. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser
24 volts

12. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The blower relay coil
Evaporator
Check for tight connections at electrical terminals
Compressor

13. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The lines must be covered by PVC to prevent contact with the masonry material
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
Near a return-air grill

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
The lines must be covered by PVC to prevent contact with the masonry material
Compressor
A compression fitting

15. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Metering device (restrictor)
The heating control circuit
Refrigerant must be added to the system
The coil is precharged with nitrogen

16. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
To prevent condensation from forming
The temperature increases
Insulated
Must be coiled horizontally and the vapor must flow from top to bottom

17. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
A compression fitting
A TXV
Compressor
Have a minimum perimeter of 3' larger than the unit being served

18. Before energizing a newly installed system - what test should always be done...
Refrigerant must be added to the system
Evaporator
The contactor coil
Check for tight connections at electrical terminals

19. What is the 'Y' terminal used for on the thermostat...
Condenser
The power from the transformer
Near a return-air grill
The cooling contactor coil

20. What is the purpose for insulating a suction line...
The coil is precharged with nitrogen
To prevent condensation from forming
Compressor
The lines must be covered by PVC to prevent contact with the masonry material

21. A secondary drain line...
To prevent condensation from forming
The cooling contactor coil
Near a return-air grill
Must be located in a conspicuous place to serve as an alarm

22. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
To prevent condensation from forming
To prevent condensation from forming
Metering device (restrictor)
The contactor coil

23. What is the 'G' terminal used for on the thermostat...
208-volt/240-volt single-phase power supply
The blower relay coil
Capillary action
The heating control circuit

24. What is the 'W' terminal used for on the thermostat...
Condenser
The accumulator
The heating control circuit
Condenser

25. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Compressor
The contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom

26. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Condenser
Capillary action
208-volt/240-volt single-phase power supply

27. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage
The suction line must be pitched toward the condensing unit
Refrigerant must be added to the system

28. What is the secondary voltage on a step-down control transformer for a residential furnace...
Check for tight connections at electrical terminals
24 volts
The accumulator
A TXV

29. In a sealed system - as the pressure increases...
The temperature increases
Insulated
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming

30. Quick-connect fittings are commonly used on...
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage
The accumulator
Precharged refrigeration linesets

31. In a sealed system - as the pressure increases...
Must be located in a conspicuous place to serve as an alarm
Have a minimum perimeter of 3' larger than the unit being served
Check for tight connections at electrical terminals
The temperature increases

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

33. Which part of the system prevents liquid from entering the compressor...
The heating control circuit
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action
The accumulator

34. If ductwork is located in an attic or crawl space - it must be...
Compressor
Must be located in a conspicuous place to serve as an alarm
Insulated
A TXV

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...
The lines must be covered by PVC to prevent contact with the masonry material
The cooling contactor coil
Metering device
Refrigerant must be added to the system

36. An auxiliary drain pan must...

37. What is the secondary voltage on a step-down control transformer for a residential furnace...
The receiver
Insulated
Refrigerant must be added to the system
24 volts

38. What type of fitting uses an O-ring to help seal its joint...
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom
The coil is precharged with nitrogen
A compression fitting

39. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The cooling contactor coil
Metering device (restrictor)
Compressor
Evaporator

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

41. An auxiliary drain pan must...

42. What is the 'are' terminal used for on the thermostat...
Compressor
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Have a minimum perimeter of 3' larger than the unit being served
The power from the transformer

43. When installing a refrigeration line set through a masonry wall
24 volts
Condenser
The lines must be covered by PVC to prevent contact with the masonry material
To prevent condensation from forming

44. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
To prevent condensation from forming
Insulated
Evaporator
To prevent condensation from forming

45. Which part of the system stores refrigerant until it is needed in the evaporator...
Metering device
The cooling contactor coil
The receiver
Have a minimum perimeter of 3' larger than the unit being served

46. A split-system air conditioning unit has...
Compressor
Near a return-air grill
Capillary action
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

47. What is the 'are' terminal used for on the thermostat...
The suction line must be pitched toward the condensing unit
Evaporator
The power from the transformer
Insulated

48. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Condenser
A TXV
Must be located in a conspicuous place to serve as an alarm
Check for tight connections at electrical terminals

49. What is the 'W' terminal used for on the thermostat...
This will prevent settling of the ground - which can cause refrigerant line damage
The heating control circuit
A TXV
The receiver

50. 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
Must be located in a conspicuous place to serve as an alarm
Check for tight connections at electrical terminals
Compressor