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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. Which part of the system prevents liquid from entering the compressor...
The temperature increases
Metering device
The accumulator
Insulated

2. A secondary drain line...
Have a minimum perimeter of 3' larger than the unit being served
Capillary action
Must be located in a conspicuous place to serve as an alarm
Evaporator

3. If ductwork is located in an attic or crawl space - it must be...
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
Insulated
Evaporator

4. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
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
Evaporator

5. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
Have a minimum perimeter of 3' larger than the unit being served
Metering device (restrictor)
Compressor

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

7. What is the 'Y' terminal used for on the thermostat...
Near a return-air grill
Near a return-air grill
The cooling contactor coil
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

8. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage
Condenser
A TXV

9. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Refrigerant must be added to the system
This will prevent settling of the ground - which can cause refrigerant line damage
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

10. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The accumulator
The contactor coil
The suction line must be pitched toward the condensing unit
Metering device (restrictor)

11. What is the 'are' terminal used for on the thermostat...
208-volt/240-volt single-phase power supply
The power from the transformer
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming

12. An auxiliary drain pan must...

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13. 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 coil is precharged with nitrogen
The heating control circuit
The accumulator

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

15. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Precharged refrigeration linesets
This will prevent settling of the ground - which can cause refrigerant line damage
Check for tight connections at electrical terminals
Must be coiled horizontally and the vapor must flow from top to bottom

16. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The lines must be covered by PVC to prevent contact with the masonry material
Metering device
The coil is precharged with nitrogen
24 volts

17. In a sealed system - as the pressure increases...
Near a return-air grill
The temperature increases
Metering device
Precharged refrigeration linesets

18. If ductwork is located in an attic or crawl space - it must be...
The accumulator
The coil is precharged with nitrogen
Insulated
Must be located in a conspicuous place to serve as an alarm

19. 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
24 volts
Insulated
Metering device

20. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom
The heating control circuit
Metering device

21. A room thermostat should be mounted...
Insulated
Evaporator
Near a return-air grill
Have a minimum perimeter of 3' larger than the unit being served

22. What is the 'are' terminal used for on the thermostat...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator
The blower relay coil
The power from the transformer

23. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Condenser
The receiver
Compressor
Must be coiled horizontally and the vapor must flow from top to bottom

24. 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
Near a return-air grill
The suction line must be pitched toward the condensing unit
Evaporator

25. A room thermostat should be mounted...
Check for tight connections at electrical terminals
Near a return-air grill
Refrigerant must be added to the system
Must be located in a conspicuous place to serve as an alarm

26. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Condenser
To prevent condensation from forming
Near a return-air grill
Capillary action

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

28. What is the secondary voltage on a step-down control transformer for a residential furnace...
Insulated
24 volts
Precharged refrigeration linesets
The suction line must be pitched toward the condensing unit

29. Which part of the system prevents liquid from entering the compressor...
The heating control circuit
The accumulator
The lines must be covered by PVC to prevent contact with the masonry material
Condenser

30. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
The power from the transformer
Evaporator
Evaporator

31. What is the 'W' terminal used for on the thermostat...
Capillary action
The heating control circuit
Condenser
A compression fitting

32. What type of fitting uses an O-ring to help seal its joint...
Compressor
The accumulator
A compression fitting
24 volts

33. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
Precharged refrigeration linesets
Refrigerant must be added to the system
Have a minimum perimeter of 3' larger than the unit being served
The coil is precharged with nitrogen

34. Residential split-system outdoor condensing units are commonly wired with a...
The heating control circuit
Near a return-air grill
208-volt/240-volt single-phase power supply
The contactor coil

35. What type of metering device is used on a 12 SEER split air conditioning system...
The lines must be covered by PVC to prevent contact with the masonry material
A TXV
Insulated
Capillary action

36. 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 power from the transformer
Refrigerant must be added to the system
Condenser
A compression fitting

37. When installing a refrigeration line set through a masonry wall
Must be located in a conspicuous place to serve as an alarm
The lines must be covered by PVC to prevent contact with the masonry material
To prevent condensation from forming
A compression fitting

38. What is the 'G' terminal used for on the thermostat...
A TXV
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

39. What is the 'W' terminal used for on the thermostat...
24 volts
The heating control circuit
Capillary action
208-volt/240-volt single-phase power supply

40. Quick-connect fittings are commonly used on...
The receiver
Precharged refrigeration linesets
The suction line must be pitched toward the condensing unit
The lines must be covered by PVC to prevent contact with the masonry material

41. An auxiliary drain pan must...

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42. What is the purpose for insulating a suction line...
To prevent condensation from forming
Near a return-air grill
The cooling contactor coil
The contactor coil

43. 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
Evaporator
To prevent condensation from forming
The contactor coil

44. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
A compression fitting
Compressor
Evaporator
Metering device (restrictor)

45. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Metering device
Evaporator
24 volts
Condenser

46. To ensure proper oil return to the compressor - when installing a refrigeration line set...
The accumulator
Condenser
Insulated
The suction line must be pitched toward the condensing unit

47. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Have a minimum perimeter of 3' larger than the unit being served
The suction line must be pitched toward the condensing unit
Refrigerant must be added to the system
The accumulator

48. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The lines must be covered by PVC to prevent contact with the masonry material
Compressor
The cooling contactor coil
Insulated

49. When installing a refrigeration line set through a masonry wall
Metering device
To prevent condensation from forming
Refrigerant must be added to the system
The lines must be covered by PVC to prevent contact with the masonry material

50. Before energizing a newly installed system - what test should always be done...
Must be located in a conspicuous place to serve as an alarm
The receiver
Must be coiled horizontally and the vapor must flow from top to bottom
Check for tight connections at electrical terminals

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NATE Air Conditioning Components

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