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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. A secondary drain line...
Near a return-air grill
Must be located in a conspicuous place to serve as an alarm
Have a minimum perimeter of 3' larger than the unit being served
The temperature increases

2. 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
Metering device (restrictor)
A TXV
Check for tight connections at electrical terminals

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

4. Which part of the system stores refrigerant until it is needed in the evaporator...
Condenser
The receiver
The accumulator
A TXV

5. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The receiver
Precharged refrigeration linesets
Must be coiled horizontally and the vapor must flow from top to bottom
To prevent condensation from forming

6. 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
Refrigerant must be added to the system
Near a return-air grill
Capillary action

7. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The temperature increases
The suction line must be pitched toward the condensing unit
Precharged refrigeration linesets
The contactor coil

8. What is the 'are' terminal used for on the thermostat...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Refrigerant must be added to the system
The power from the transformer
Have a minimum perimeter of 3' larger than the unit being served

9. What is the 'W' terminal used for on the thermostat...
The temperature increases
Evaporator
To prevent condensation from forming
The heating control circuit

10. When installing a refrigeration line set through a masonry wall
A compression fitting
Refrigerant must be added to the system
The lines must be covered by PVC to prevent contact with the masonry material
Condenser

11. An auxiliary drain pan must...

12. What is the purpose for insulating a suction line...
To prevent condensation from forming
The accumulator
Precharged refrigeration linesets
Compressor

13. What is the 'Y' terminal used for on the thermostat...
Metering device (restrictor)
The suction line must be pitched toward the condensing unit
The cooling contactor coil
24 volts

14. What is the secondary voltage on a step-down control transformer for a residential furnace...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Precharged refrigeration linesets
Must be coiled horizontally and the vapor must flow from top to bottom
24 volts

15. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The heating control circuit
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Check for tight connections at electrical terminals
Must be coiled horizontally and the vapor must flow from top to bottom

16. A split-system air conditioning unit has...
Compressor
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor
Compressor

17. An auxiliary drain pan must...

18. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
To prevent condensation from forming
The contactor coil
A TXV
Evaporator

19. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The heating control circuit
Condenser
The temperature increases
Capillary action

20. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device
The coil is precharged with nitrogen
A compression fitting

21. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
24 volts
Insulated
Compressor

22. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The temperature increases
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
208-volt/240-volt single-phase power supply

23. Residential split-system outdoor condensing units are commonly wired with a...
The heating control circuit
208-volt/240-volt single-phase power supply
The coil is precharged with nitrogen
The heating control circuit

24. When installing a refrigeration line set through a masonry wall
The cooling contactor coil
Have a minimum perimeter of 3' larger than the unit being served
The lines must be covered by PVC to prevent contact with the masonry material
A compression fitting

25. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The accumulator
Compressor
The contactor coil
Compressor

26. What type of metering device is used on a 12 SEER split air conditioning system...
Have a minimum perimeter of 3' larger than the unit being served
Refrigerant must be added to the system
A TXV
The receiver

27. A secondary drain line...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The heating control circuit
Refrigerant must be added to the system
Must be located in a conspicuous place to serve as an alarm

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

29. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The lines must be covered by PVC to prevent contact with the masonry material
The coil is precharged with nitrogen
Have a minimum perimeter of 3' larger than the unit being served
Have a minimum perimeter of 3' larger than the unit being served

30. Residential split-system outdoor condensing units are commonly wired with a...
The receiver
208-volt/240-volt single-phase power supply
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom

31. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The heating control circuit
The accumulator
Compressor
Evaporator

32. If ductwork is located in an attic or crawl space - it must be...
Insulated
Must be located in a conspicuous place to serve as an alarm
208-volt/240-volt single-phase power supply
The cooling contactor coil

33. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Must be located in a conspicuous place to serve as an alarm
The power from the transformer
The suction line must be pitched toward the condensing unit
Evaporator

34. A split-system air conditioning unit has...
The temperature increases
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Metering device (restrictor)
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...
The coil is precharged with nitrogen
24 volts
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

36. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
Have a minimum perimeter of 3' larger than the unit being served
The accumulator
Capillary action

37. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The lines must be covered by PVC to prevent contact with the masonry material
24 volts
Capillary action
The coil is precharged with nitrogen

38. What is the 'G' terminal used for on the thermostat...
The suction line must be pitched toward the condensing unit
The coil is precharged with nitrogen
The accumulator
The blower relay coil

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

40. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The contactor coil
Compressor
Compressor
Compressor

41. Before energizing a newly installed system - what test should always be done...
The temperature increases
Must be coiled horizontally and the vapor must flow from top to bottom
Check for tight connections at electrical terminals
24 volts

42. 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
The suction line must be pitched toward the condensing unit
A compression fitting

43. To ensure proper oil return to the compressor - when installing a refrigeration line set...
208-volt/240-volt single-phase power supply
Condenser
The suction line must be pitched toward the condensing unit
Insulated

44. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
The cooling contactor coil
Metering device (restrictor)
Refrigerant must be added to the system

45. If ductwork is located in an attic or crawl space - it must be...
The power from the transformer
Refrigerant must be added to the system
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Insulated

46. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Have a minimum perimeter of 3' larger than the unit being served
Metering device
Compressor
Insulated

47. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Evaporator
A compression fitting
Metering device (restrictor)
The heating control circuit

48. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
Compressor
Evaporator
Capillary action

49. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The receiver
Compressor
The cooling contactor coil
Capillary action

50. What is the 'W' terminal used for on the thermostat...
The heating control circuit
A TXV
The contactor coil
The power from the transformer