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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. In a sealed system - as the pressure increases...
Precharged refrigeration linesets
The cooling contactor coil
This will prevent settling of the ground - which can cause refrigerant line damage
The temperature increases

2. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Precharged refrigeration linesets
Refrigerant must be added to the system
A TXV
Compressor

3. Which part of the system stores refrigerant until it is needed in the evaporator...
Metering device (restrictor)
Evaporator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The receiver

4. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
A TXV
Compressor
The cooling contactor coil

5. What is the 'W' terminal used for on the thermostat...
Must be located in a conspicuous place to serve as an alarm
Condenser
Check for tight connections at electrical terminals
The heating control circuit

6. 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 located in a conspicuous place to serve as an alarm
Condenser
The receiver
Metering device

7. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Capillary action
Evaporator
Condenser
The coil is precharged with nitrogen

8. What is the secondary voltage on a step-down control transformer for a residential furnace...
The heating control circuit
24 volts
Check for tight connections at electrical terminals
Capillary action

9. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
To prevent condensation from forming
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom
Have a minimum perimeter of 3' larger than the unit being served

10. 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
Condenser
Have a minimum perimeter of 3' larger than the unit being served
Compressor

11. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The cooling contactor coil
Condenser
208-volt/240-volt single-phase power supply
The coil is precharged with nitrogen

12. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Must be located in a conspicuous place to serve as an alarm
Compressor
The cooling contactor coil

13. What type of metering device is used on a 12 SEER split air conditioning system...
The heating control circuit
The lines must be covered by PVC to prevent contact with the masonry material
A TXV
Condenser

14. What is the purpose for insulating a suction line...
Evaporator
To prevent condensation from forming
This will prevent settling of the ground - which can cause refrigerant line damage
Capillary action

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

16. In a sealed system - as the pressure increases...
The temperature increases
The suction line must be pitched toward the condensing unit
The power from the transformer
The suction line must be pitched toward the condensing unit

17. What is the 'Y' terminal used for on the thermostat...
Evaporator
The cooling contactor coil
Must be coiled horizontally and the vapor must flow from top to bottom
208-volt/240-volt single-phase power supply

18. 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 cooling contactor coil
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
Refrigerant must be added to the system

19. A split-system air conditioning unit has...
Compressor
Must be coiled horizontally and the vapor must flow from top to bottom
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The heating control circuit

20. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The receiver
The cooling contactor coil
The suction line must be pitched toward the condensing unit
The contactor coil

21. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Refrigerant must be added to the system
A compression fitting
The suction line must be pitched toward the condensing unit
To prevent condensation from forming

22. An auxiliary drain pan must...

23. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Condenser
Compressor
Check for tight connections at electrical terminals
A TXV

24. If ductwork is located in an attic or crawl space - it must be...
Insulated
A TXV
A TXV
Metering device

25. When installing a refrigeration line set through a masonry wall
Precharged refrigeration linesets
The lines must be covered by PVC to prevent contact with the masonry material
The blower relay coil
This will prevent settling of the ground - which can cause refrigerant line damage

26. When installing a refrigeration line set through a masonry wall
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
The temperature increases
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...
Near a return-air grill
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom
Refrigerant must be added to the system

28. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The receiver
Refrigerant must be added to the system
Metering device (restrictor)
This will prevent settling of the ground - which can cause refrigerant line damage

29. Which part of the system prevents liquid from entering the compressor...
The accumulator
The power from the transformer
Must be coiled horizontally and the vapor must flow from top to bottom
A compression fitting

30. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Condenser
Metering device (restrictor)
The coil is precharged with nitrogen
The accumulator

31. Quick-connect fittings are commonly used on...
Insulated
Compressor
Condenser
Precharged refrigeration linesets

32. 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
Near a return-air grill
Compressor
Precharged refrigeration linesets

33. 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
Have a minimum perimeter of 3' larger than the unit being served
Compressor
The temperature increases

34. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
Refrigerant must be added to the system

35. What type of fitting uses an O-ring to help seal its joint...
This will prevent settling of the ground - which can cause refrigerant line damage
A compression fitting
The blower relay coil
208-volt/240-volt single-phase power supply

36. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
The suction line must be pitched toward the condensing unit
Metering device
The accumulator

37. What is the 'are' terminal used for on the thermostat...
Refrigerant must be added to the system
The power from the transformer
This will prevent settling of the ground - which can cause refrigerant line damage
The blower relay coil

38. Before energizing a newly installed system - what test should always be done...
Precharged refrigeration linesets
Condenser
The blower relay coil
Check for tight connections at electrical terminals

39. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Check for tight connections at electrical terminals
Condenser
This will prevent settling of the ground - which can cause refrigerant line damage
The contactor coil

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

41. What is the 'G' terminal used for on the thermostat...
The receiver
The blower relay coil
Condenser
The heating control circuit

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

43. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
Capillary action
Must be coiled horizontally and the vapor must flow from top to bottom
This will prevent settling of the ground - which can cause refrigerant line damage

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

45. A room thermostat should be mounted...
Near a return-air grill
The receiver
Precharged refrigeration linesets
Evaporator

46. What is the secondary voltage on a step-down control transformer for a residential furnace...
The lines must be covered by PVC to prevent contact with the masonry material
The temperature increases
A TXV
24 volts

47. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
24 volts
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
Compressor

48. A split-system air conditioning unit has...
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm
Capillary action
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

49. Residential split-system outdoor condensing units are commonly wired with a...
To prevent condensation from forming
208-volt/240-volt single-phase power supply
Metering device (restrictor)
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

50. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Insulated
Metering device (restrictor)
Evaporator
Metering device