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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. Which part of the system stores refrigerant until it is needed in the evaporator...
The lines must be covered by PVC to prevent contact with the masonry material
Compressor
The receiver
Metering device

2. What type of fitting uses an O-ring to help seal its joint...
Near a return-air grill
A compression fitting
Near a return-air grill
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

3. In a sealed system - as the pressure increases...
24 volts
The temperature increases
Evaporator
Metering device (restrictor)

4. What is the secondary voltage on a step-down control transformer for a residential furnace...
Have a minimum perimeter of 3' larger than the unit being served
24 volts
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Check for tight connections at electrical terminals

5. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
208-volt/240-volt single-phase power supply
The contactor coil
A TXV
24 volts

6. What is the purpose for insulating a suction line...
Evaporator
A compression fitting
To prevent condensation from forming
Evaporator

7. Which part of the system stores refrigerant until it is needed in the evaporator...
Precharged refrigeration linesets
Refrigerant must be added to the system
Must be coiled horizontally and the vapor must flow from top to bottom
The receiver

8. What is the 'are' terminal used for on the thermostat...
The contactor coil
Condenser
Evaporator
The power from the transformer

9. A split-system air conditioning unit has...
Refrigerant must be added to the system
Near a return-air grill
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor

10. Before energizing a newly installed system - what test should always be done...
A compression fitting
Compressor
The receiver
Check for tight connections at electrical terminals

11. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Capillary action
Must be coiled horizontally and the vapor must flow from top to bottom
208-volt/240-volt single-phase power supply
Compressor

12. What is the 'G' terminal used for on the thermostat...
Condenser
The receiver
The blower relay coil
A compression fitting

13. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Check for tight connections at electrical terminals
The cooling contactor coil
The accumulator
Compressor

14. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Have a minimum perimeter of 3' larger than the unit being served
The cooling contactor coil
24 volts
Condenser

15. 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 lines must be covered by PVC to prevent contact with the masonry material
Metering device (restrictor)

16. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
Insulated
The coil is precharged with nitrogen
Near a return-air grill

17. In a sealed system - as the pressure increases...
The temperature increases
24 volts
The blower relay coil
Evaporator

18. What is the 'Y' terminal used for on the thermostat...
Evaporator
Metering device
The cooling contactor coil
Compressor

19. What is the 'W' terminal used for on the thermostat...
Near a return-air grill
The contactor coil
Refrigerant must be added to the system
The heating control circuit

20. 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
24 volts
Metering device
The temperature increases

21. 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
Compressor
Have a minimum perimeter of 3' larger than the unit being served

22. 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
Insulated
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The lines must be covered by PVC to prevent contact with the masonry material

23. A room thermostat should be mounted...
208-volt/240-volt single-phase power supply
Refrigerant must be added to the system
Near a return-air grill
Check for tight connections at electrical terminals

24. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Compressor
Condenser
Metering device (restrictor)
The suction line must be pitched toward the condensing unit

25. Residential split-system outdoor condensing units are commonly wired with a...
208-volt/240-volt single-phase power supply
The suction line must be pitched toward the condensing unit
A TXV
Evaporator

26. An auxiliary drain pan must...

27. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The accumulator
Capillary action
The suction line must be pitched toward the condensing unit

28. What is the 'W' terminal used for on the thermostat...
The accumulator
24 volts
The heating control circuit
Near a return-air grill

29. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
The lines must be covered by PVC to prevent contact with the masonry material
The cooling contactor coil
Compressor

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

31. Quick-connect fittings are commonly used on...
The suction line must be pitched toward the condensing unit
Near a return-air grill
Insulated
Precharged refrigeration linesets

32. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
Refrigerant must be added to the system
Metering device (restrictor)
To prevent condensation from forming

33. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
A compression fitting
Have a minimum perimeter of 3' larger than the unit being served
Must be coiled horizontally and the vapor must flow from top to bottom

34. Before energizing a newly installed system - what test should always be done...
Condenser
The contactor coil
Check for tight connections at electrical terminals
Compressor

35. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Check for tight connections at electrical terminals
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The coil is precharged with nitrogen
The accumulator

36. Which part of the system prevents liquid from entering the compressor...
Check for tight connections at electrical terminals
The accumulator
Metering device
The contactor coil

37. What is the 'are' terminal used for on the thermostat...
Evaporator
208-volt/240-volt single-phase power supply
To prevent condensation from forming
The power from the transformer

38. What is the 'G' terminal used for on the thermostat...
The temperature increases
Evaporator
Precharged refrigeration linesets
The blower relay coil

39. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Check for tight connections at electrical terminals
The cooling contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor

40. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The accumulator
Have a minimum perimeter of 3' larger than the unit being served
A compression fitting
Metering device (restrictor)

41. If ductwork is located in an attic or crawl space - it must be...
Insulated
208-volt/240-volt single-phase power supply
Compressor
Compressor

42. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Metering device
Near a return-air grill
The contactor coil
Condenser

43. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Check for tight connections at electrical terminals
This will prevent settling of the ground - which can cause refrigerant line damage
The temperature increases
Compressor

44. What is the purpose for insulating a suction line...
The lines must be covered by PVC to prevent contact with the masonry material
To prevent condensation from forming
Near a return-air grill
208-volt/240-volt single-phase power supply

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

46. 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
Refrigerant must be added to the system
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Metering device

47. 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
Condenser
Have a minimum perimeter of 3' larger than the unit being served
Precharged refrigeration linesets

48. 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
Evaporator
Metering device
The contactor coil

49. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
Capillary action
A compression fitting
Insulated

50. 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
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Near a return-air grill
Insulated