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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. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
Insulated
Metering device (restrictor)
The blower relay coil

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

3. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
The receiver
The suction line must be pitched toward the condensing unit
The blower relay coil
Compressor

4. If ductwork is located in an attic or crawl space - it must be...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Insulated
Refrigerant must be added to the system
Metering device (restrictor)

5. Quick-connect fittings are commonly used on...
Precharged refrigeration linesets
Evaporator
Metering device (restrictor)
Condenser

6. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
The coil is precharged with nitrogen
Check for tight connections at electrical terminals
Insulated

7. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Check for tight connections at electrical terminals
24 volts
Metering device
Evaporator

8. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
The suction line must be pitched toward the condensing unit
The accumulator
The accumulator

9. What type of fitting uses an O-ring to help seal its joint...
The heating control circuit
Condenser
The coil is precharged with nitrogen
A compression fitting

10. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Insulated
The temperature increases
The accumulator
This will prevent settling of the ground - which can cause refrigerant line damage

11. What is the 'Y' terminal used for on the thermostat...
Metering device (restrictor)
The cooling contactor coil
Precharged refrigeration linesets
A TXV

12. What is the 'G' terminal used for on the thermostat...
The temperature increases
The blower relay coil
To prevent condensation from forming
A TXV

13. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Compressor
The contactor coil
208-volt/240-volt single-phase power supply
Metering device (restrictor)

14. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Condenser
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator
A TXV

15. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
The receiver
Check for tight connections at electrical terminals
The lines must be covered by PVC to prevent contact with the masonry material
Evaporator

16. Which part of the system prevents liquid from entering the compressor...
The temperature increases
The accumulator
Check for tight connections at electrical terminals
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

17. A secondary drain line...
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm
A TXV
A compression fitting

18. A split-system air conditioning unit has...
Metering device (restrictor)
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator
Evaporator

19. A room thermostat should be mounted...
The heating control circuit
Near a return-air grill
A compression fitting
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

20. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
Evaporator
Compressor
Must be located in a conspicuous place to serve as an alarm
Precharged refrigeration linesets

21. Before energizing a newly installed system - what test should always be done...
Check for tight connections at electrical terminals
24 volts
Refrigerant must be added to the system
Near a return-air grill

22. When installing a refrigeration line set through a masonry wall
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
This will prevent settling of the ground - which can cause refrigerant line damage
The lines must be covered by PVC to prevent contact with the masonry material
The temperature increases

23. 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
The temperature increases
The receiver
The temperature increases

24. What is the 'G' terminal used for on the thermostat...
The blower relay coil
Check for tight connections at electrical terminals
208-volt/240-volt single-phase power supply
The lines must be covered by PVC to prevent contact with the masonry material

25. What is the secondary voltage on a step-down control transformer for a residential furnace...
The coil is precharged with nitrogen
Compressor
Compressor
24 volts

26. What is the purpose for insulating a suction line...
Evaporator
The receiver
Refrigerant must be added to the system
To prevent condensation from forming

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

28. What is the purpose for insulating a suction line...
The receiver
The power from the transformer
To prevent condensation from forming
A compression fitting

29. What is the 'are' terminal used for on the thermostat...
Evaporator
The coil is precharged with nitrogen
The temperature increases
The power from the transformer

30. 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
Must be located in a conspicuous place to serve as an alarm
Compressor
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

31. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The suction line must be pitched toward the condensing unit
Capillary action
Condenser
Must be coiled horizontally and the vapor must flow from top to bottom

32. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Near a return-air grill
Capillary action
Condenser
The accumulator

33. What is the 'Y' terminal used for on the thermostat...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
To prevent condensation from forming
The receiver
The cooling contactor coil

34. 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
To prevent condensation from forming
24 volts

35. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Must be located in a conspicuous place to serve as an alarm
The suction line must be pitched toward the condensing unit
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Metering device

36. What is the 'are' terminal used for on the thermostat...
Compressor
Condenser
Capillary action
The power from the transformer

37. An auxiliary drain pan must...

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38. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
A compression fitting
208-volt/240-volt single-phase power supply
Condenser
The cooling contactor coil

39. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
Condenser
A TXV
The accumulator
Evaporator

40. Residential split-system outdoor condensing units are commonly wired with a...
The blower relay coil
Insulated
208-volt/240-volt single-phase power supply
Refrigerant must be added to the system

41. 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
The blower relay coil
Insulated
Capillary action

42. If ductwork is located in an attic or crawl space - it must be...
Check for tight connections at electrical terminals
Refrigerant must be added to the system
Must be coiled horizontally and the vapor must flow from top to bottom
Insulated

43. Why is it recommended to add a gravel fill under the pad of a condensing unit...
Precharged refrigeration linesets
Evaporator
Refrigerant must be added to the system
This will prevent settling of the ground - which can cause refrigerant line damage

44. In a sealed system - as the pressure increases...
Evaporator
The temperature increases
Refrigerant must be added to the system
Have a minimum perimeter of 3' larger than the unit being served

45. Which part of the system prevents liquid from entering the compressor...
A compression fitting
Condenser
A compression fitting
The accumulator

46. 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 lines must be covered by PVC to prevent contact with the masonry material
The receiver
The coil is precharged with nitrogen
Refrigerant must be added to the system

47. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
The blower relay coil
Metering device (restrictor)
Compressor
208-volt/240-volt single-phase power supply

48. What type of metering device is used on a 12 SEER split air conditioning system...
The cooling contactor coil
The power from the transformer
24 volts
A TXV

49. In a sealed system - as the pressure increases...
Compressor
A TXV
Near a return-air grill
The temperature increases

50. A split-system air conditioning unit has...
Insulated
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Compressor
Compressor

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NATE Air Conditioning Components

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