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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. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The suction line must be pitched toward the condensing unit
The cooling contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom
The temperature increases

2. What is the purpose for insulating a suction line...
To prevent condensation from forming
The power from the transformer
The lines must be covered by PVC to prevent contact with the masonry material
Metering device (restrictor)

3. In a sealed system - as the pressure increases...
Metering device (restrictor)
The temperature increases
The heating control circuit
The receiver

4. A split-system air conditioning unit has...
Metering device (restrictor)
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The coil is precharged with nitrogen
208-volt/240-volt single-phase power supply

5. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The blower relay coil
Metering device
Must be located in a conspicuous place to serve as an alarm
Metering device (restrictor)

6. 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
Precharged refrigeration linesets
A compression fitting
To prevent condensation from forming

7. When installing a refrigeration line set through a masonry wall
The coil is precharged with nitrogen
The cooling contactor coil
The lines must be covered by PVC to prevent contact with the masonry material
The suction line must be pitched toward the condensing unit

8. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Precharged refrigeration linesets
The coil is precharged with nitrogen
The suction line must be pitched toward the condensing unit
Evaporator

9. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Capillary action
A TXV
The power from the transformer
The lines must be covered by PVC to prevent contact with the masonry material

10. A room thermostat should be mounted...
Metering device (restrictor)
The cooling contactor coil
Near a return-air grill
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

11. Which part of the system prevents liquid from entering the compressor...
The accumulator
The cooling contactor coil
Precharged refrigeration linesets
Check for tight connections at electrical terminals

12. Quick-connect fittings are commonly used on...
The receiver
The contactor coil
Precharged refrigeration linesets
The heating control circuit

13. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The power from the transformer
Evaporator
Check for tight connections at electrical terminals
Condenser

14. What type of fitting uses an O-ring to help seal its joint...
Metering device
A compression fitting
The lines must be covered by PVC to prevent contact with the masonry material
Near a return-air grill

15. A split-system air conditioning unit has...
Precharged refrigeration linesets
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
A TXV

16. Which part of the system prevents liquid from entering the compressor...
Condenser
The accumulator
Metering device (restrictor)
To prevent condensation from forming

17. A room thermostat should be mounted...
Near a return-air grill
Refrigerant must be added to the system
Have a minimum perimeter of 3' larger than the unit being served
Condenser

18. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Evaporator
The suction line must be pitched toward the condensing unit
Metering device

19. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom
Capillary action
Evaporator

20. What is the 'W' terminal used for on the thermostat...
The coil is precharged with nitrogen
Capillary action
The accumulator
The heating control circuit

21. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The accumulator
Evaporator
The suction line must be pitched toward the condensing unit
The blower relay coil

22. What is the 'W' terminal used for on the thermostat...
A TXV
The lines must be covered by PVC to prevent contact with the masonry material
The heating control circuit
Check for tight connections at electrical terminals

23. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
208-volt/240-volt single-phase power supply
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The cooling contactor coil

24. An auxiliary drain pan must...

25. In a sealed system - as the pressure increases...
The temperature increases
Precharged refrigeration linesets
208-volt/240-volt single-phase power supply
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

26. What type of fitting uses an O-ring to help seal its joint...
Must be coiled horizontally and the vapor must flow from top to bottom
The receiver
Compressor
A compression fitting

27. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Metering device
Compressor
Condenser
Precharged refrigeration linesets

28. What is the 'G' terminal used for on the thermostat...
Condenser
Metering device (restrictor)
The blower relay coil
The temperature increases

29. If ductwork is located in an attic or crawl space - it must be...
Metering device (restrictor)
Insulated
Must be coiled horizontally and the vapor must flow from top to bottom
Precharged refrigeration linesets

30. An auxiliary drain pan must...

31. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The temperature increases
208-volt/240-volt single-phase power supply
The suction line must be pitched toward the condensing unit
Metering device (restrictor)

32. If ductwork is located in an attic or crawl space - it must be...
Insulated
A compression fitting
The temperature increases
Metering device

33. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
A compression fitting
Compressor
Evaporator
Refrigerant must be added to the system

34. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The coil is precharged with nitrogen
This will prevent settling of the ground - which can cause refrigerant line damage
Compressor
Must be coiled horizontally and the vapor must flow from top to bottom

35. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Refrigerant must be added to the system
Condenser
Evaporator

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

37. What is the purpose for insulating a suction line...
A TXV
The accumulator
To prevent condensation from forming
Must be coiled horizontally and the vapor must flow from top to bottom

38. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Evaporator
Capillary action
The heating control circuit
The blower relay coil

39. Residential split-system outdoor condensing units are commonly wired with a...
The lines must be covered by PVC to prevent contact with the masonry material
208-volt/240-volt single-phase power supply
The contactor coil
Have a minimum perimeter of 3' larger than the unit being served

40. What is the 'are' terminal used for on the thermostat...
The power from the transformer
Must be coiled horizontally and the vapor must flow from top to bottom
Condenser
The receiver

41. A secondary drain line...
Capillary action
Must be located in a conspicuous place to serve as an alarm
A TXV
Have a minimum perimeter of 3' larger than the unit being served

42. What is the 'are' terminal used for on the thermostat...
208-volt/240-volt single-phase power supply
The power from the transformer
The lines must be covered by PVC to prevent contact with the masonry material
Capillary action

43. What is the 'G' terminal used for on the thermostat...
Condenser
Check for tight connections at electrical terminals
The coil is precharged with nitrogen
The blower relay coil

44. What type of metering device is used on a 12 SEER split air conditioning system...
Near a return-air grill
A TXV
Evaporator
The receiver

45. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Metering device (restrictor)
Check for tight connections at electrical terminals
The contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom

46. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Must be coiled horizontally and the vapor must flow from top to bottom
Refrigerant must be added to the system
The coil is precharged with nitrogen
Check for tight connections at electrical terminals

47. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Precharged refrigeration linesets
Condenser
Have a minimum perimeter of 3' larger than the unit being served
Refrigerant must be added to the system

48. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Evaporator
The cooling contactor coil
Compressor
The coil is precharged with nitrogen

49. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
To prevent condensation from forming
Compressor
The suction line must be pitched toward the condensing unit
Capillary action

50. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Capillary action
The receiver
This will prevent settling of the ground - which can cause refrigerant line damage
The heating control circuit