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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 purpose for insulating a suction line...
24 volts
To prevent condensation from forming
Capillary action
24 volts

2. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Refrigerant must be added to the system
Check for tight connections at electrical terminals
Compressor
Metering device (restrictor)

3. What is the 'are' terminal used for on the thermostat...
The power from the transformer
A compression fitting
Condenser
The suction line must be pitched toward the condensing unit

4. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
The accumulator
The cooling contactor coil
The power from the transformer

5. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Condenser
Check for tight connections at electrical terminals
Must be coiled horizontally and the vapor must flow from top to bottom
Evaporator

6. Before energizing a newly installed system - what test should always be done...
Evaporator
208-volt/240-volt single-phase power supply
Check for tight connections at electrical terminals
Precharged refrigeration linesets

7. A room thermostat should be mounted...
Evaporator
Condenser
The contactor coil
Near a return-air grill

8. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Insulated
Compressor
Condenser
The coil is precharged with nitrogen

9. Which part of the system prevents liquid from entering the compressor...
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming
The accumulator
208-volt/240-volt single-phase power supply

10. What is the secondary voltage on a step-down control transformer for a residential furnace...
A compression fitting
24 volts
Near a return-air grill
The power from the transformer

11. What is the purpose for insulating a suction line...
To prevent condensation from forming
The power from the transformer
Condenser
Compressor

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

13. 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 blower relay coil
The power from the transformer
Refrigerant must be added to the system
Condenser

14. Residential split-system outdoor condensing units are commonly wired with a...
The receiver
208-volt/240-volt single-phase power supply
The power from the transformer
Metering device (restrictor)

15. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
Compressor
Near a return-air grill
The cooling contactor coil

16. What type of metering device is used on a 12 SEER split air conditioning system...
Compressor
Condenser
A TXV
The receiver

17. An auxiliary drain pan must...

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18. 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 heating control circuit
The blower relay coil
The contactor coil

19. A room thermostat should be mounted...
Evaporator
Near a return-air grill
Evaporator
Compressor

20. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Compressor
A compression fitting
Must be coiled horizontally and the vapor must flow from top to bottom

21. A split-system air conditioning unit has...
Evaporator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The blower relay coil
This will prevent settling of the ground - which can cause refrigerant line damage

22. 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
The temperature increases
Metering device

23. What is the 'G' terminal used for on the thermostat...
Metering device
Have a minimum perimeter of 3' larger than the unit being served
Refrigerant must be added to the system
The blower relay coil

24. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The suction line must be pitched toward the condensing unit
The cooling contactor coil
This will prevent settling of the ground - which can cause refrigerant line damage
The heating control circuit

25. What is the 'W' terminal used for on the thermostat...
Condenser
The coil is precharged with nitrogen
The heating control circuit
Have a minimum perimeter of 3' larger than the unit being served

26. What is the 'Y' terminal used for on the thermostat...
A compression fitting
The blower relay coil
A TXV
The cooling contactor coil

27. 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
The temperature increases
The blower relay coil

28. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
This will prevent settling of the ground - which can cause refrigerant line damage
The coil is precharged with nitrogen
A TXV
Evaporator

29. If ductwork is located in an attic or crawl space - it must be...
Condenser
Near a return-air grill
Insulated
The contactor coil

30. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The suction line must be pitched toward the condensing unit
The receiver
Evaporator
The receiver

31. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The heating control circuit
The suction line must be pitched toward the condensing unit
To prevent condensation from forming
24 volts

32. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
Compressor
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage

33. What is the 'Y' terminal used for on the thermostat...
The cooling contactor coil
Must be located in a conspicuous place to serve as an alarm
The temperature increases
Compressor

34. What is the 'W' terminal used for on the thermostat...
Compressor
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The heating control circuit
Check for tight connections at electrical terminals

35. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The coil is precharged with nitrogen
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

36. When installing a refrigeration line set through a masonry wall
The contactor coil
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
Insulated

37. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The contactor coil
Condenser
Condenser
Compressor

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

39. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Capillary action
Must be coiled horizontally and the vapor must flow from top to bottom
Metering device
Have a minimum perimeter of 3' larger than the unit being served

40. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The blower relay coil
208-volt/240-volt single-phase power supply
Must be located in a conspicuous place to serve as an alarm
Capillary action

41. Which part of the system stores refrigerant until it is needed in the evaporator...
The receiver
The suction line must be pitched toward the condensing unit
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

42. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
The suction line must be pitched toward the condensing unit
Metering device
Capillary action
The power from the transformer

43. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Insulated
The accumulator
The heating control circuit
Evaporator

44. In a sealed system - as the pressure increases...
Metering device
The temperature increases
Evaporator
Refrigerant must be added to the system

45. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The receiver
Precharged refrigeration linesets
Compressor
24 volts

46. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
The coil is precharged with nitrogen
Metering device
The accumulator
The power from the transformer

47. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Near a return-air grill
Condenser
Capillary action
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

48. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
24 volts
A TXV
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...
Metering device
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator
Must be located in a conspicuous place to serve as an alarm

50. In a sealed system - as the pressure increases...
Compressor
The contactor coil
The temperature increases
The contactor coil