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

2. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Near a return-air grill
The coil is precharged with nitrogen
The receiver
Compressor

3. When installing a refrigeration line set through a masonry wall
24 volts
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
208-volt/240-volt single-phase power supply

4. Before energizing a newly installed system - what test should always be done...
The blower relay coil
Compressor
Check for tight connections at electrical terminals
208-volt/240-volt single-phase power supply

5. Residential split-system outdoor condensing units are commonly wired with a...
Compressor
208-volt/240-volt single-phase power supply
Insulated
Evaporator

6. 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
Have a minimum perimeter of 3' larger than the unit being served
Insulated
The power from the transformer

7. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Compressor
The cooling contactor coil
Evaporator
Metering device

8. What is the purpose for insulating a suction line...
Must be located in a conspicuous place to serve as an alarm
The blower relay coil
To prevent condensation from forming
This will prevent settling of the ground - which can cause refrigerant line damage

9. Which part of the system prevents liquid from entering the compressor...
Insulated
The suction line must be pitched toward the condensing unit
The accumulator
Refrigerant must be added to the system

10. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
Refrigerant must be added to the system
Check for tight connections at electrical terminals
Metering device

11. Residential split-system outdoor condensing units are commonly wired with a...
Metering device (restrictor)
208-volt/240-volt single-phase power supply
The blower relay coil
Refrigerant must be added to the system

12. What is the 'Y' terminal used for on the thermostat...
Compressor
The accumulator
Compressor
The cooling contactor coil

13. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator
Have a minimum perimeter of 3' larger than the unit being served
Must be coiled horizontally and the vapor must flow from top to bottom

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

15. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
The accumulator
Metering device
Capillary action

16. What is the purpose for insulating a suction line...
The power from the transformer
A TXV
Metering device (restrictor)
To prevent condensation from forming

17. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The cooling contactor coil
Evaporator
This will prevent settling of the ground - which can cause refrigerant line damage
The accumulator

18. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The accumulator
The coil is precharged with nitrogen
Insulated
A TXV

19. 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
24 volts
Condenser
The blower relay coil

20. In a sealed system - as the pressure increases...
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom
The temperature increases
24 volts

21. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
Near a return-air grill
To prevent condensation from forming
The receiver

22. A secondary drain line...
Evaporator
The heating control circuit
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm

23. An auxiliary drain pan must...

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24. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The heating control circuit
Metering device (restrictor)
Refrigerant must be added to the system
To prevent condensation from forming

25. A split-system air conditioning unit has...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Insulated
Capillary action
208-volt/240-volt single-phase power supply

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

27. What is the 'Y' terminal used for on the thermostat...
The accumulator
The contactor coil
The cooling contactor coil
The suction line must be pitched toward the condensing unit

28. What is the 'W' terminal used for on the thermostat...
The heating control circuit
The accumulator
Check for tight connections at electrical terminals
Evaporator

29. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Evaporator
A compression fitting
Condenser
The suction line must be pitched toward the condensing unit

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

31. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
To prevent condensation from forming
Condenser
The contactor coil
Near a return-air grill

32. 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 accumulator
Metering device
Evaporator

33. 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
208-volt/240-volt single-phase power supply
Insulated
A TXV

34. What type of fitting uses an O-ring to help seal its joint...
A TXV
The cooling contactor coil
A compression fitting
Insulated

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

36. If ductwork is located in an attic or crawl space - it must be...
Evaporator
The heating control circuit
Insulated
The suction line must be pitched toward the condensing unit

37. What is the 'are' terminal used for on the thermostat...
Must be coiled horizontally and the vapor must flow from top to bottom
The contactor coil
The power from the transformer
To prevent condensation from forming

38. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
24 volts
Metering device
Evaporator
This will prevent settling of the ground - which can cause refrigerant line damage

39. What is the secondary voltage on a step-down control transformer for a residential furnace...
24 volts
Near a return-air grill
The blower relay coil
Precharged refrigeration linesets

40. Which part of the system prevents liquid from entering the compressor...
The coil is precharged with nitrogen
The accumulator
Check for tight connections at electrical terminals
Evaporator

41. In a sealed system - as the pressure increases...
The temperature increases
Precharged refrigeration linesets
208-volt/240-volt single-phase power supply
The blower relay coil

42. 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
The power from the transformer
A compression fitting

43. Which part of the system stores refrigerant until it is needed in the evaporator...
Metering device
Must be located in a conspicuous place to serve as an alarm
The cooling contactor coil
The receiver

44. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Capillary action
Evaporator
The coil is precharged with nitrogen
Compressor

45. What type of metering device is used on a 12 SEER split air conditioning system...
A TXV
Insulated
Precharged refrigeration linesets
The heating control circuit

46. Quick-connect fittings are commonly used on...
Insulated
Refrigerant must be added to the system
A TXV
Precharged refrigeration linesets

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

48. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Capillary action
Metering device
The blower relay coil
Condenser

49. What is the 'G' terminal used for on the thermostat...
The blower relay coil
208-volt/240-volt single-phase power supply
Check for tight connections at electrical terminals
A TXV

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