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NATE Air Conditioning Components

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 type of metering device is used on a 12 SEER split air conditioning system...
A TXV
Refrigerant must be added to the system
The receiver
Must be coiled horizontally and the vapor must flow from top to bottom

2. What type of fitting uses an O-ring to help seal its joint...
24 volts
A compression fitting
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
To prevent condensation from forming

3. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Metering device (restrictor)
Condenser
Check for tight connections at electrical terminals

4. Which part of the system stores refrigerant until it is needed in the evaporator...
Metering device
Capillary action
The receiver
Condenser

5. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
Condenser
Refrigerant must be added to the system
Must be coiled horizontally and the vapor must flow from top to bottom
The temperature increases

6. A room thermostat should be mounted...
Evaporator
Near a return-air grill
Condenser
The heating control circuit

7. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
To prevent condensation from forming
The power from the transformer
Evaporator
Metering device

8. What is the 'Y' terminal used for on the thermostat...
This will prevent settling of the ground - which can cause refrigerant line damage
The power from the transformer
The cooling contactor coil
Metering device (restrictor)

9. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Metering device (restrictor)
Compressor
Evaporator
Condenser

10. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
208-volt/240-volt single-phase power supply
To prevent condensation from forming
208-volt/240-volt single-phase power supply
Capillary action

11. A split-system air conditioning unit has...
Metering device
Near a return-air grill
The accumulator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

12. 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
Condenser
The contactor coil
The blower relay coil

13. 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 temperature increases
Precharged refrigeration linesets
The coil is precharged with nitrogen

14. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Compressor
208-volt/240-volt single-phase power supply
Must be coiled horizontally and the vapor must flow from top to bottom
The lines must be covered by PVC to prevent contact with the masonry material

15. What is the purpose for insulating a suction line...
Condenser
The receiver
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
To prevent condensation from forming

16. Which part of the system prevents liquid from entering the compressor...
The receiver
The suction line must be pitched toward the condensing unit
The power from the transformer
The accumulator

17. What is the 'are' terminal used for on the thermostat...
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom
The receiver
The power from the transformer

18. What type of metering device is used on a 12 SEER split air conditioning system...
Refrigerant must be added to the system
A TXV
Must be coiled horizontally and the vapor must flow from top to bottom
Check for tight connections at electrical terminals

19. Residential split-system outdoor condensing units are commonly wired with a...
Compressor
208-volt/240-volt single-phase power supply
Compressor
The cooling contactor coil

20. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Must be coiled horizontally and the vapor must flow from top to bottom
The temperature increases
This will prevent settling of the ground - which can cause refrigerant line damage
208-volt/240-volt single-phase power supply

21. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Near a return-air grill
Refrigerant must be added to the system
Metering device (restrictor)
Refrigerant must be added to the system

22. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
208-volt/240-volt single-phase power supply
Condenser
A compression fitting

23. When installing a refrigeration line set through a masonry wall
The blower relay coil
To prevent condensation from forming
The lines must be covered by PVC to prevent contact with the masonry material
Check for tight connections at electrical terminals

24. In a sealed system - as the pressure increases...
Metering device (restrictor)
Condenser
The temperature increases
Compressor

25. If ductwork is located in an attic or crawl space - it must be...
208-volt/240-volt single-phase power supply
Insulated
The blower relay coil
Condenser

26. What is the secondary voltage on a step-down control transformer for a residential furnace...
Near a return-air grill
The blower relay coil
24 volts
The suction line must be pitched toward the condensing unit

27. What is the purpose for insulating a suction line...
Must be coiled horizontally and the vapor must flow from top to bottom
A TXV
To prevent condensation from forming
Have a minimum perimeter of 3' larger than the unit being served

28. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
24 volts
Refrigerant must be added to the system
Compressor
Capillary action

29. What is the 'Y' terminal used for on the thermostat...
The accumulator
The coil is precharged with nitrogen
The temperature increases
The cooling contactor coil

30. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Metering device
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material
The accumulator

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

32. Quick-connect fittings are commonly used on...
This will prevent settling of the ground - which can cause refrigerant line damage
The receiver
Precharged refrigeration linesets
The temperature increases

33. What is the 'W' terminal used for on the thermostat...
Evaporator
Capillary action
Precharged refrigeration linesets
The heating control circuit

34. What is the 'G' terminal used for on the thermostat...
The power from the transformer
The blower relay coil
Check for tight connections at electrical terminals
Insulated

35. An auxiliary drain pan must...

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

37. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Metering device
The temperature increases
The contactor coil
Insulated

38. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Evaporator
The power from the transformer
208-volt/240-volt single-phase power supply
The blower relay coil

39. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The lines must be covered by PVC to prevent contact with the masonry material
This will prevent settling of the ground - which can cause refrigerant line damage
Evaporator
To prevent condensation from forming

40. To ensure proper oil return to the compressor - when installing a refrigeration line set...
This will prevent settling of the ground - which can cause refrigerant line damage
The receiver
The contactor coil
The suction line must be pitched toward the condensing unit

41. 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 power from the transformer
Capillary action
The contactor coil

42. A secondary drain line...
Insulated
Must be located in a conspicuous place to serve as an alarm
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser

43. What is the 'W' terminal used for on the thermostat...
Metering device
The heating control circuit
Precharged refrigeration linesets
Metering device (restrictor)

44. A room thermostat should be mounted...
Near a return-air grill
Evaporator
The receiver
Must be coiled horizontally and the vapor must flow from top to bottom

45. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Compressor
Insulated
Metering device (restrictor)
The contactor coil

46. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
The temperature increases
The power from the transformer
Refrigerant must be added to the system
Condenser

47. An auxiliary drain pan must...

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48. What is the 'are' terminal used for on the thermostat...
Evaporator
The lines must be covered by PVC to prevent contact with the masonry material
A TXV
The power from the transformer

49. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Precharged refrigeration linesets
Metering device
The blower relay coil
The power from the transformer

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

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NATE Air Conditioning Components

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