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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 secondary voltage on a step-down control transformer for a residential furnace...
This will prevent settling of the ground - which can cause refrigerant line damage
Have a minimum perimeter of 3' larger than the unit being served
Evaporator
24 volts

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

3. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The contactor coil
A TXV
Metering device
Near a return-air grill

4. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Compressor
Capillary action
Refrigerant must be added to the system
Must be coiled horizontally and the vapor must flow from top to bottom

5. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Condenser
The suction line must be pitched toward the condensing unit
The coil is precharged with nitrogen

6. What is the purpose for insulating a suction line...
Compressor
208-volt/240-volt single-phase power supply
To prevent condensation from forming
Evaporator

7. A split-system air conditioning unit has...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator
208-volt/240-volt single-phase power supply
The heating control circuit

8. What type of metering device is used on a 12 SEER split air conditioning system...
The contactor coil
A TXV
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage

9. In a sealed system - as the pressure increases...
Compressor
The temperature increases
Evaporator
The accumulator

10. Which part of the system prevents liquid from entering the compressor...
The suction line must be pitched toward the condensing unit
The accumulator
The coil is precharged with nitrogen
The cooling contactor coil

11. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The lines must be covered by PVC to prevent contact with the masonry material
The contactor coil
Evaporator
The suction line must be pitched toward the condensing unit

12. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
Must be located in a conspicuous place to serve as an alarm
Have a minimum perimeter of 3' larger than the unit being served
Check for tight connections at electrical terminals

13. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Evaporator
24 volts
Condenser
A compression fitting

14. 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
To prevent condensation from forming
Condenser
A TXV

15. Before energizing a newly installed system - what test should always be done...
Evaporator
Metering device (restrictor)
24 volts
Check for tight connections at electrical terminals

16. In a sealed system - as the pressure increases...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The receiver
The temperature increases
The lines must be covered by PVC to prevent contact with the masonry material

17. A room thermostat should be mounted...
Evaporator
Near a return-air grill
Precharged refrigeration linesets
The temperature increases

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

19. Before energizing a newly installed system - what test should always be done...
The contactor coil
This will prevent settling of the ground - which can cause refrigerant line damage
The power from the transformer
Check for tight connections at electrical terminals

20. Residential split-system outdoor condensing units are commonly wired with a...
Precharged refrigeration linesets
208-volt/240-volt single-phase power supply
Condenser
The accumulator

21. What type of fitting uses an O-ring to help seal its joint...
208-volt/240-volt single-phase power supply
The power from the transformer
A compression fitting
The suction line must be pitched toward the condensing unit

22. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Metering device
Must be coiled horizontally and the vapor must flow from top to bottom
The suction line must be pitched toward the condensing unit
The coil is precharged with nitrogen

23. A room thermostat should be mounted...
A compression fitting
24 volts
Near a return-air grill
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

24. 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 coil is precharged with nitrogen
The blower relay coil
Capillary action
Refrigerant must be added to the system

25. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Insulated
The coil is precharged with nitrogen
Condenser
Metering device

26. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Must be located in a conspicuous place to serve as an alarm
Insulated
Must be coiled horizontally and the vapor must flow from top to bottom
Evaporator

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

28. Which part of the system prevents liquid from entering the compressor...
The accumulator
A TXV
The lines must be covered by PVC to prevent contact with the masonry material
Condenser

29. A secondary drain line...
Check for tight connections at electrical terminals
The suction line must be pitched toward the condensing unit
The heating control circuit
Must be located in a conspicuous place to serve as an alarm

30. What is the purpose for insulating a suction line...
The temperature increases
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The blower relay coil
To prevent condensation from forming

31. What is the 'Y' terminal used for on the thermostat...
Condenser
Compressor
Evaporator
The cooling contactor coil

32. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
To prevent condensation from forming
The blower relay coil
The heating control circuit
Capillary action

33. What is the 'Y' terminal used for on the thermostat...
Check for tight connections at electrical terminals
Evaporator
The cooling contactor coil
The accumulator

34. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Condenser
Refrigerant must be added to the system
Refrigerant must be added to the system
Evaporator

35. What is the secondary voltage on a step-down control transformer for a residential furnace...
The heating control circuit
24 volts
The lines must be covered by PVC to prevent contact with the masonry material
208-volt/240-volt single-phase power supply

36. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
The power from the transformer
The heating control circuit
Capillary action

37. When installing a refrigeration line set through a masonry wall
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The blower relay coil
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material

38. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Insulated
Refrigerant must be added to the system
The lines must be covered by PVC to prevent contact with the masonry material
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

39. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
Condenser
Near a return-air grill
Precharged refrigeration linesets

40. Quick-connect fittings are commonly used on...
This will prevent settling of the ground - which can cause refrigerant line damage
Have a minimum perimeter of 3' larger than the unit being served
Precharged refrigeration linesets
The blower relay coil

41. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Condenser
The heating control circuit
Compressor
The suction line must be pitched toward the condensing unit

42. Residential split-system outdoor condensing units are commonly wired with a...
Capillary action
Refrigerant must be added to the system
208-volt/240-volt single-phase power supply
The receiver

43. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
208-volt/240-volt single-phase power supply
208-volt/240-volt single-phase power supply
The coil is precharged with nitrogen

44. If ductwork is located in an attic or crawl space - it must be...
Have a minimum perimeter of 3' larger than the unit being served
Insulated
Capillary action
Precharged refrigeration linesets

45. Why is it recommended to add a gravel fill under the pad of a condensing unit...
208-volt/240-volt single-phase power supply
This will prevent settling of the ground - which can cause refrigerant line damage
The cooling contactor coil
Compressor

46. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The suction line must be pitched toward the condensing unit
The coil is precharged with nitrogen
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

47. What is the 'G' terminal used for on the thermostat...
Capillary action
Have a minimum perimeter of 3' larger than the unit being served
The contactor coil
The blower relay coil

48. 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
The blower relay coil
Metering device
Insulated

49. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Insulated
The suction line must be pitched toward the condensing unit
A compression fitting
Compressor

50. What is the 'G' terminal used for on the thermostat...
The lines must be covered by PVC to prevent contact with the masonry material
The blower relay coil
A compression fitting
The heating control circuit