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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...
The power from the transformer
To prevent condensation from forming
Evaporator
The blower relay coil

2. What type of fitting uses an O-ring to help seal its joint...
Metering device (restrictor)
A compression fitting
Evaporator
To prevent condensation from forming

3. A secondary drain line...
208-volt/240-volt single-phase power supply
Must be located in a conspicuous place to serve as an alarm
The accumulator
Compressor

4. 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
Must be located in a conspicuous place to serve as an alarm
To prevent condensation from forming
Capillary action

5. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
The cooling contactor coil
Have a minimum perimeter of 3' larger than the unit being served

6. What is the 'W' terminal used for on the thermostat...
Have a minimum perimeter of 3' larger than the unit being served
The coil is precharged with nitrogen
Capillary action
The heating control circuit

7. In a sealed system - as the pressure increases...
Evaporator
Precharged refrigeration linesets
Refrigerant must be added to the system
The temperature increases

8. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Refrigerant must be added to the system
Capillary action
Insulated

9. Before energizing a newly installed system - what test should always be done...
This will prevent settling of the ground - which can cause refrigerant line damage
The contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom
Check for tight connections at electrical terminals

10. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The receiver
Compressor
Metering device
The power from the transformer

11. What is the secondary voltage on a step-down control transformer for a residential furnace...
The power from the transformer
24 volts
This will prevent settling of the ground - which can cause refrigerant line damage
Compressor

12. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom
Compressor
Must be located in a conspicuous place to serve as an alarm

13. Which part of the system prevents liquid from entering the compressor...
Refrigerant must be added to the system
Condenser
A TXV
The accumulator

14. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
A TXV
Compressor
The heating control circuit
The accumulator

15. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
Capillary action
The receiver
The heating control circuit

16. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The coil is precharged with nitrogen
Near a return-air grill
Have a minimum perimeter of 3' larger than the unit being served
Capillary action

17. Quick-connect fittings are commonly used on...
Evaporator
Precharged refrigeration linesets
Condenser
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

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

19. What is the 'are' terminal used for on the thermostat...
The accumulator
The heating control circuit
Compressor
The power from the transformer

20. A room thermostat should be mounted...
208-volt/240-volt single-phase power supply
A TXV
Near a return-air grill
Capillary action

21. An auxiliary drain pan must...

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22. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Metering device
The heating control circuit
Metering device

23. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Refrigerant must be added to the system
The power from the transformer
Insulated
The suction line must be pitched toward the condensing unit

24. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Compressor
Condenser
The power from the transformer
The accumulator

25. What is the 'are' terminal used for on the thermostat...
Check for tight connections at electrical terminals
Have a minimum perimeter of 3' larger than the unit being served
The power from the transformer
The cooling contactor coil

26. What is the 'Y' terminal used for on the thermostat...
Condenser
208-volt/240-volt single-phase power supply
The cooling contactor coil
To prevent condensation from forming

27. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The cooling contactor coil
The heating control circuit
The accumulator
Condenser

28. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
This will prevent settling of the ground - which can cause refrigerant line damage
Refrigerant must be added to the system
Near a return-air grill

29. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
To prevent condensation from forming
The heating control circuit
The contactor coil

30. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Insulated
The power from the transformer
The contactor coil

31. What type of metering device is used on a 12 SEER split air conditioning system...
Compressor
Metering device (restrictor)
Check for tight connections at electrical terminals
A TXV

32. What is the 'G' terminal used for on the thermostat...
The lines must be covered by PVC to prevent contact with the masonry material
Precharged refrigeration linesets
The blower relay coil
Condenser

33. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The cooling contactor coil
Evaporator
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage

34. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Near a return-air grill
Evaporator
Have a minimum perimeter of 3' larger than the unit being served
The contactor coil

35. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Have a minimum perimeter of 3' larger than the unit being served
The suction line must be pitched toward the condensing unit
The contactor coil
The blower relay coil

36. Before energizing a newly installed system - what test should always be done...
The cooling contactor coil
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

37. If ductwork is located in an attic or crawl space - it must be...
Metering device
Insulated
Check for tight connections at electrical terminals
Have a minimum perimeter of 3' larger than the unit being served

38. A room thermostat should be mounted...
Precharged refrigeration linesets
Near a return-air grill
Have a minimum perimeter of 3' larger than the unit being served
Evaporator

39. 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
A compression fitting
The receiver
Metering device (restrictor)

40. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Capillary action
Must be coiled horizontally and the vapor must flow from top to bottom
The receiver
Must be located in a conspicuous place to serve as an alarm

41. If ductwork is located in an attic or crawl space - it must be...
The suction line must be pitched toward the condensing unit
Capillary action
A compression fitting
Insulated

42. What is the purpose for insulating a suction line...
To prevent condensation from forming
The receiver
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil

43. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
The lines must be covered by PVC to prevent contact with the masonry material
Insulated
Near a return-air grill

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

45. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Insulated
Condenser
Metering device
The lines must be covered by PVC to prevent contact with the masonry material

46. What is the 'G' terminal used for on the thermostat...
The blower relay coil
Capillary action
The cooling contactor coil
Condenser

47. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The contactor coil
The blower relay coil
The coil is precharged with nitrogen
208-volt/240-volt single-phase power supply

48. Which part of the system prevents liquid from entering the compressor...
Compressor
The accumulator
The receiver
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

49. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The suction line must be pitched toward the condensing unit
208-volt/240-volt single-phase power supply
A compression fitting
Must be coiled horizontally and the vapor must flow from top to bottom

50. What is the 'W' terminal used for on the thermostat...
Condenser
The receiver
The heating control circuit
The coil is precharged with nitrogen