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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. If ductwork is located in an attic or crawl space - it must be...
The power from the transformer
Check for tight connections at electrical terminals
Compressor
Insulated

2. What is the secondary voltage on a step-down control transformer for a residential furnace...
Evaporator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Insulated
24 volts

3. Which part of the system stores refrigerant until it is needed in the evaporator...
The temperature increases
Condenser
The receiver
Refrigerant must be added to the system

4. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The blower relay coil
Condenser
Compressor
The power from the transformer

5. If ductwork is located in an attic or crawl space - it must be...
Insulated
Refrigerant must be added to the system
24 volts
Check for tight connections at electrical terminals

6. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The coil is precharged with nitrogen
Capillary action
The power from the transformer
Insulated

7. Before energizing a newly installed system - what test should always be done...
Metering device (restrictor)
The power from the transformer
Condenser
Check for tight connections at electrical terminals

8. What is the purpose for insulating a suction line...
The coil is precharged with nitrogen
To prevent condensation from forming
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Check for tight connections at electrical terminals

9. What is the 'are' terminal used for on the thermostat...
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
Compressor
The power from the transformer

10. 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 coiled horizontally and the vapor must flow from top to bottom
Capillary action
The cooling contactor coil

11. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Metering device (restrictor)
Compressor
The power from the transformer
The contactor coil

12. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The blower relay coil
Metering device (restrictor)
To prevent condensation from forming
208-volt/240-volt single-phase power supply

13. 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 coiled horizontally and the vapor must flow from top to bottom
Precharged refrigeration linesets
The temperature increases

14. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Insulated
Evaporator
The power from the transformer
The heating control circuit

15. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Evaporator
Condenser
The contactor coil

16. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Must be coiled horizontally and the vapor must flow from top to bottom
Must be located in a conspicuous place to serve as an alarm
The blower relay coil
Evaporator

17. What is the 'W' terminal used for on the thermostat...
The heating control circuit
Precharged refrigeration linesets
208-volt/240-volt single-phase power supply
This will prevent settling of the ground - which can cause refrigerant line damage

18. When installing a refrigeration line set through a masonry wall
Compressor
Insulated
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material

19. A room thermostat should be mounted...
Metering device
Metering device (restrictor)
Near a return-air grill
Insulated

20. In a sealed system - as the pressure increases...
The coil is precharged with nitrogen
Evaporator
The temperature increases
Evaporator

21. What is the 'Y' terminal used for on the thermostat...
Near a return-air grill
The cooling contactor coil
The blower relay coil
The accumulator

22. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Have a minimum perimeter of 3' larger than the unit being served
Condenser
The cooling contactor coil
Compressor

23. 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
Condenser
The suction line must be pitched toward the condensing unit
The accumulator

24. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Check for tight connections at electrical terminals
The accumulator
The suction line must be pitched toward the condensing unit

25. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
Must be located in a conspicuous place to serve as an alarm
Refrigerant must be added to the system
The temperature increases

26. Which part of the system prevents liquid from entering the compressor...
Capillary action
The receiver
The accumulator
The suction line must be pitched toward the condensing unit

27. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Evaporator
208-volt/240-volt single-phase power supply
The blower relay coil
Condenser

28. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Near a return-air grill
Evaporator
The temperature increases
Must be coiled horizontally and the vapor must flow from top to bottom

29. 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 accumulator
Refrigerant must be added to the system
The power from the transformer
Have a minimum perimeter of 3' larger than the unit being served

30. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
The heating control circuit
The lines must be covered by PVC to prevent contact with the masonry material
Condenser
Capillary action

31. What is the secondary voltage on a step-down control transformer for a residential furnace...
A TXV
The power from the transformer
Near a return-air grill
24 volts

32. What type of fitting uses an O-ring to help seal its joint...
The power from the transformer
The cooling contactor coil
A compression fitting
To prevent condensation from forming

33. What is the 'W' terminal used for on the thermostat...
Condenser
The lines must be covered by PVC to prevent contact with the masonry material
The heating control circuit
The temperature increases

34. What is the purpose for insulating a suction line...
Near a return-air grill
The cooling contactor coil
Check for tight connections at electrical terminals
To prevent condensation from forming

35. 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
The lines must be covered by PVC to prevent contact with the masonry material
The accumulator
To prevent condensation from forming

36. An auxiliary drain pan must...

37. 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
Near a return-air grill
The accumulator
Compressor

38. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Condenser
The blower relay coil
The contactor coil
The coil is precharged with nitrogen

39. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Metering device
The temperature increases
Precharged refrigeration linesets
Refrigerant must be added to the system

40. 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
The cooling contactor coil

41. A room thermostat should be mounted...
Condenser
Precharged refrigeration linesets
The power from the transformer
Near a return-air grill

42. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
Check for tight connections at electrical terminals
The receiver
The coil is precharged with nitrogen

43. A secondary drain line...
The lines must be covered by PVC to prevent contact with the masonry material
Must be located in a conspicuous place to serve as an alarm
Metering device (restrictor)
Evaporator

44. Which part of the system stores refrigerant until it is needed in the evaporator...
Compressor
The receiver
The cooling contactor coil
Capillary action

45. A secondary drain line...
The blower relay coil
Must be located in a conspicuous place to serve as an alarm
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

46. When installing a refrigeration line set through a masonry wall
24 volts
Evaporator
Near a return-air grill
The lines must be covered by PVC to prevent contact with the masonry material

47. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
Compressor
To prevent condensation from forming
The temperature increases

48. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Have a minimum perimeter of 3' larger than the unit being served
The temperature increases
The accumulator
The contactor coil

49. What is the 'are' terminal used for on the thermostat...
Compressor
Condenser
The power from the transformer
Capillary action

50. Quick-connect fittings are commonly used on...
The contactor coil
Near a return-air grill
Check for tight connections at electrical terminals
Precharged refrigeration linesets