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NATE Air Conditioning Troubleshooting

Instructions:

Answer 50 questions in 15 minutes.
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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 a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
An open internal overload protector
The sight glass is full of liquid+the sight glass is full of gas
20 to 30
An overcharged system

2. A commercial customer calls on a 90
The system has been overcharged+The system has air trapped in the condenser
A defective circuit breaker
An acid-core suction line drier
It is used to control refrigerant pressure in the compressor crankcase

3. Which of the following is a possible cause for a compressor to overheat...
Technician B
A plugged filter drier
Technician B
A low refrigerant charge

4. Air filters should be replaced...
Current in the compressor circuit
'G' to 'C'
The low-side pressure will decrease and the evaporator coil will be partially frosted
Whenever necessary

5. If a rooftop air conditioning system does not have any means of low ambient protection - what will be two symptoms of the system when operating under a low ambient condition...
A defective circuit breaker
An increase in low-side pressure
Technician B
High superheat and low discharge pressure

6. A customer calls with an insufficient cooling complaint. Upon arrival to the service call it is found that the outdoor condensing unit is operating - but the indoor blower is not in operation. Technician A says that it is possible that it is a bad fu
Both technicians are incorrect
Condenser fans operating during a low ambient condition and a low suction pressure
Lack of airflow
The sensing bulb at a lower temperature than the valve body

7. When testing an indoor blower control circuit and the cooling circuit on a fan center - what terminals should read 24 volts if the air conditioning system is in operation...

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8. Which of the following will cause excessive discharge pressures on an air conditioning system...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Always have some liquid present in the bulb and diaphragm
Dirty condenser - bent condenser fins - and air recirculating over the condenser

9. A hard-start kit for an air conditioning system...
The system has been overcharged+The system has air trapped in the condenser
Increases starting torque
A start capacitor and a solid-state relay
An overcharged system

10. A customer calls with an insufficient cooling complaint on a 90
A vacuum test+oil traces around fittings+soap bubble solution
An overcharged system
Technician B
A bad thermostat

11. The technician observes that the compressor is not operating. The compressor windings read 5 ohms start to run - run to common is opened - and start to common is opened. The technician concludes that...
Low voltage and a faulty start relay
Technician A is correct
A start capacitor and a solid-state relay
The internal overload is opened

12. A system that uses a thermal electric expansion valve...
An overcharged system
An overcharged system
Clean the condenser coil
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

13. The best description of a relay would be...
A plugged filter drier
Contains a solenoid coil and one or more sets of contacts
Partially frosted evaporator and high superheat
Both technicians are correct

14. Which of the following will cause excessive discharge pressures on an air conditioning system...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A missing air filter+improper rotation of the indoor blower+blower too small
Technician A is correct
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

15. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
Both technicians are correct
An acid-core suction line drier
Flooding the condenser - cycling condenser fans - and dampering condenser air
An overcharged system

16. What are common methods that are used for leak-testing a system...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A vacuum test+oil traces around fittings+soap bubble solution
('Y' and 'C') and ('G' and 'C')
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

17. What problem can cause an increase of discharge pressure and an increase of suction pressure...
'G' to 'C'
A sensing bulb improperly connected to the suction line
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An overcharged system

18. Technician A says that to manually pump down an air conditioning system with a two-position service valve - the liquid line must be front-seated and the high- and low-side pressure will decrease to 0 psig when the pump-down is complete. Technician B
Technician B
A bad thermostat
An undercharged system+insufficient airflow over the evaporator coil
Technician A is correct

19. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
110-120
An undercharge and low ambient conditions
An overcharged system
Technician A

20. Insufficient airflow can be caused by...
Whenever necessary
High suction pressure and low superheat
An increase of air leakage from ductwork
Technician B

21. A hard-start kit consists of...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A start capacitor and a solid-state relay
A bad thermostat
20 to 30

22. A customer calls to complain that his central air conditioning system is not cooling properly. The technician arrives on the job. He or she notices that the indoor blower has adequate airflow and the outdoor condenser fan is operating - but the compr
It is used to control refrigerant pressure in the compressor crankcase
Technician A is correct
An open internal overload protector
The oil pump pressure and the crankcase pressure

23. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Run with high head and high suction pressure
High superheat and low discharge pressure
110-120
Lack of airflow

24. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Bad compressor valve
The superheat increases and the subcooling decreases
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

25. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
Both technicians are incorrect
An increase in suction pressure and an increase in discharge pressure
20 to 30
An acid-core suction line drier

26. When using a vapor-charged TXV bulb - it is necessary to have...
The internal overload is opened
The superheat increases and the subcooling decreases
Short cycling and insufficient dehumidification
The sensing bulb at a lower temperature than the valve body

27. Superheat is found in an air conditioning system in the...
High superheat and low discharge pressure
Evaporator and compressor
Partially frosted evaporator and high superheat
Technician B

28. What are the symptoms of an air conditioning system that has a low charge...
Technician A
Always have some liquid present in the bulb and diaphragm
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
The low-side pressure will decrease and the evaporator coil will be partially frosted

29. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
Evaporator and compressor
Whenever necessary
High suction pressure and low superheat
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

30. A system that is operating with a clear sight glass shows...
A sensing bulb improperly connected to the suction line
The sight glass is full of liquid+the sight glass is full of gas
20 to 30
Low superheat

31. Air filters should be replaced...
Low superheat
The discharge pressure increases and the amperage increases
A vacuum test+oil traces around fittings+soap bubble solution
Whenever necessary

32. What are common methods that are used for leak-testing a system...
Low superheat
Dirty condenser - bent condenser fins - and air recirculating over the condenser
A vacuum test+oil traces around fittings+soap bubble solution
Both technicians are correct

33. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
Flooding the condenser - cycling condenser fans - and dampering condenser air
An open internal overload protector
A missing air filter+improper rotation of the indoor blower+blower too small
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

34. A technician receives an air conditioning service call stating that the system is operating but isn't cooling properly. When the technician arrives - she notices that the compressor has recently been changed and it is an are-22 system. She checks the
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
A blown fuse
The superheat will increase and the low-side pressure will decrease
Clean the condenser coil

35. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
Both technicians are incorrect
The discharge pressure increases and the amperage increases
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
'G' to 'C'

36. A customer calls to complain that his central air conditioning system is not cooling properly. The technician arrives on the job. He or she notices that the indoor blower has adequate airflow and the outdoor condenser fan is operating - but the compr
The internal overload is opened
An open internal overload protector
A missing air filter+improper rotation of the indoor blower+blower too small
Low voltage and a faulty start relay

37. A customer calls with an insufficient cooling complaint. Upon arrival to the service call it is found that the outdoor condensing unit is operating - but the indoor blower is not in operation. Technician A says that it is possible that it is a bad fu
The superheat increases and the subcooling decreases
Both technicians are incorrect
Lack of airflow
A plugged filter drier

38. What is the purpose of the TXV...
It keeps a constant superheat in the evaporator
A dirty condenser - recirculation of condenser air - and a defective condenser fan
20 to 30
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

39. A liquid-charged TXV bulb will...
Always have some liquid present in the bulb and diaphragm
Run with high head and high suction pressure
A start capacitor and a solid-state relay
An increase of air leakage from ductwork

40. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
110-120
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Technician B
110-120

41. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
An uninsulated TXV sensing bulb
It would cause the low-side pressure to decrease
Condenser fans operating during a low ambient condition and a low suction pressure
It keeps a constant superheat in the evaporator

42. Technician A says that to manually pump down an air conditioning system with a two-position service valve - the liquid line must be front-seated and the high- and low-side pressure will decrease to 0 psig when the pump-down is complete. Technician B
Condenser fans operating during a low ambient condition and a low suction pressure
20 to 30
Technician A is correct
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

43. What is the purpose of the TXV...
The superheat will increase and the low-side pressure will decrease
An overcharged system
An open internal overload protector
It keeps a constant superheat in the evaporator

44. What are the operating pressures of an oil pressure safety switch...
The oil pump pressure and the crankcase pressure
Technician B
An acid-core suction line drier
An overcharged system

45. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
A missing air filter+improper rotation of the indoor blower+blower too small
Technician B
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Technician A

46. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Clean the condenser coil
Condenser fans operating during a low ambient condition and a low suction pressure
Both technicians are correct
Flooding the condenser - cycling condenser fans - and dampering condenser air

47. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Broken rings+broken valves+seized bearings
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

48. What are the operating pressures of an oil pressure safety switch...
It would cause the low-side pressure to decrease
The oil pump pressure and the crankcase pressure
The external equalizer could be plugged
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

49. A system that is operating with a clear sight glass shows...
An overcharged system
The low-side pressure will decrease and the evaporator coil will be partially frosted
The sight glass is full of liquid+the sight glass is full of gas
It keeps a constant superheat in the evaporator

50. What causes the automatic expansion valve to close...
High suction pressure and low superheat
A missing air filter+improper rotation of the indoor blower+blower too small
An increase in low-side pressure
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

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NATE Air Conditioning Troubleshooting

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