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. An auxiliary drain pan must...


2. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The coil is precharged with nitrogen
The accumulator
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage


3. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
A compression fitting
The heating control circuit
The receiver


4. What is the 'Y' terminal used for on the thermostat...
The receiver
Have a minimum perimeter of 3' larger than the unit being served
The cooling contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom


5. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Refrigerant must be added to the system
Near a return-air grill
The power from the transformer


6. What is the secondary voltage on a step-down control transformer for a residential furnace...
Condenser
Near a return-air grill
24 volts
The temperature increases


7. What is the secondary voltage on a step-down control transformer for a residential furnace...
The contactor coil
The heating control circuit
The temperature increases
24 volts


8. In a sealed system - as the pressure increases...
Precharged refrigeration linesets
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Insulated
The temperature increases


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
The suction line must be pitched toward the condensing unit
Condenser
The power from the transformer


10. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
This will prevent settling of the ground - which can cause refrigerant line damage
The accumulator
The lines must be covered by PVC to prevent contact with the masonry material
Compressor


11. Quick-connect fittings are commonly used on...
A TXV
Compressor
Precharged refrigeration linesets
The receiver


12. What is the 'G' terminal used for on the thermostat...
Metering device
The blower relay coil
The suction line must be pitched toward the condensing unit
Near a return-air grill


13. Which part of the system prevents liquid from entering the compressor...
Evaporator
The accumulator
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


14. Which part of the system prevents liquid from entering the compressor...
The accumulator
A compression fitting
To prevent condensation from forming
This will prevent settling of the ground - which can cause refrigerant line damage


15. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Compressor
Evaporator
Capillary action
The temperature increases


16. What is the 'G' terminal used for on the thermostat...
Condenser
To prevent condensation from forming
The blower relay coil
Capillary action


17. Before energizing a newly installed system - what test should always be done...
208-volt/240-volt single-phase power supply
Check for tight connections at electrical terminals
The receiver
Insulated


18. What is the 'are' terminal used for on the thermostat...
The power from the transformer
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil


19. Quick-connect fittings are commonly used on...
Metering device
The lines must be covered by PVC to prevent contact with the masonry material
Precharged refrigeration linesets
Metering device (restrictor)


20. When installing a refrigeration line set through a masonry wall
A TXV
Condenser
Capillary action
The lines must be covered by PVC to prevent contact with the masonry material


21. What is the 'Y' terminal used for on the thermostat...
24 volts
The heating control circuit
The cooling contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom


22. What type of metering device is used on a 12 SEER split air conditioning system...
The contactor coil
Capillary action
A TXV
Check for tight connections at electrical terminals


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


24. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
This will prevent settling of the ground - which can cause refrigerant line damage
Metering device (restrictor)
Condenser
Capillary action


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


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


27. What is the 'W' terminal used for on the thermostat...
Insulated
The heating control circuit
This will prevent settling of the ground - which can cause refrigerant line damage
To prevent condensation from forming


28. If ductwork is located in an attic or crawl space - it must be...
Insulated
Compressor
Must be located in a conspicuous place to serve as an alarm
Refrigerant must be added to the system


29. A split-system air conditioning unit has...
Near a return-air grill
Check for tight connections at electrical terminals
The temperature increases
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator


30. What type of metering device is used on a 12 SEER split air conditioning system...
Condenser
Near a return-air grill
Near a return-air grill
A TXV


31. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The coil is precharged with nitrogen
To prevent condensation from forming
Metering device
Condenser


32. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Check for tight connections at electrical terminals
The contactor coil
The lines must be covered by PVC to prevent contact with the masonry material
Precharged refrigeration linesets


33. If ductwork is located in an attic or crawl space - it must be...
Must be located in a conspicuous place to serve as an alarm
A compression fitting
Insulated
The power from the transformer


34. Residential split-system outdoor condensing units are commonly wired with a...
The coil is precharged with nitrogen
The heating control circuit
208-volt/240-volt single-phase power supply
The suction line must be pitched toward the condensing unit


35. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The cooling contactor coil
Capillary action
Compressor
The heating control circuit


36. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Near a return-air grill
The suction line must be pitched toward the condensing unit
The coil is precharged with nitrogen
Condenser


37. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The power from the transformer
The cooling contactor coil
Near a return-air grill
This will prevent settling of the ground - which can cause refrigerant line damage


38. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Capillary action
The receiver
The power from the transformer


39. In a sealed system - as the pressure increases...
The cooling contactor coil
The temperature increases
A TXV
Insulated


40. What is the purpose for insulating a suction line...
To prevent condensation from forming
A compression fitting
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom


41. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
Condenser
Compressor
A compression fitting


42. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The heating control circuit
Refrigerant must be added to the system
Refrigerant must be added to the system
Evaporator


43. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Compressor
208-volt/240-volt single-phase power supply
Refrigerant must be added to the system
Evaporator


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


45. Which part of the system stores refrigerant until it is needed in the evaporator...
Compressor
The contactor coil
Condenser
The receiver


46. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Refrigerant must be added to the system
Metering device
Have a minimum perimeter of 3' larger than the unit being served
The suction line must be pitched toward the condensing unit


47. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Refrigerant must be added to the system
Capillary action
The receiver
208-volt/240-volt single-phase power supply


48. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Metering device
Condenser
A TXV
208-volt/240-volt single-phase power supply


49. A secondary drain line...
The lines must be covered by PVC to prevent contact with the masonry material
Check for tight connections at electrical terminals
Must be located in a conspicuous place to serve as an alarm
The suction line must be pitched toward the condensing unit


50. What is the 'W' terminal used for on the thermostat...
Must be located in a conspicuous place to serve as an alarm
Capillary action
The blower relay coil
The heating control circuit