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NATE Air Conditioning Troubleshooting

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. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
The low-side pressure will decrease and the evaporator coil will be partially frosted
The superheat increases and the subcooling decreases
Whenever necessary
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

2. A customer calls and complains that his air conditioning system is not operating properly. It is noticed that the compressor is not operating. A check on the run capacitor shows that there is 33 uf and the rating on the capacitor is 40 uf. Technician
An open internal overload protector
An undercharge and low ambient conditions
It is used to control refrigerant pressure in the compressor crankcase
Technician B

3. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
Partially frosted evaporator and high superheat
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A plugged filter drier
The internal overload is opened

4. A customer calls with an insufficient cooling complaint. Upon arrival to the service call it is found that the system is using are-22 with the high-side pressure at 290 psig and the low-side pressure at 85 psig. The ambient temperature is 85
An increase of air leakage from ductwork
3 psig
Technician A
It would cause the low-side pressure to decrease

5. The temperature range of the suction line from an air conditioning system should be...
Rise more than normal
50-65
'G' to 'C'
Whenever necessary

6. A split-system air conditioner that uses a piston-type metering device is to be charged with are-22. Technician A says that the outdoor dry-bulb temperature is needed to determine the proper superheat. Technician B says that the indoor wet-bulb tempe
Both technicians are correct
A bad thermostat
An uninsulated suction line and a restricted metering device
An uninsulated suction line and a restricted metering device

7. 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 low refrigerant charge
A defective circuit breaker
Low discharge pressure - high suction pressure - and low amp draw

8. What type of problems can be caused by an oversized air conditioning system...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
A start relay
Technician B
Short cycling and insufficient dehumidification

9. An air conditioning system that uses a fan center has an inoperable indoor blower. When the thermostat is set for cooling and dialed below room temperature - a test with the voltmeter shows that there is 24 volts across terminals 'are' and 'G' at the
A bad thermostat
An acid-core suction line drier
A plugged filter drier
Condenser fans operating during a low ambient condition and a low suction pressure

10. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
High superheat and low discharge pressure
It would cause the low-side pressure to decrease
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Both technicians are correct

11. A commercial customer calls on a 90
20 to 30
Clean the condenser coil
The system has been overcharged+The system has air trapped in the condenser
It is used to control refrigerant pressure in the compressor crankcase

12. Insufficient airflow can be caused by...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Broken rings+broken valves+seized bearings
An increase of air leakage from ductwork
A restricted metering device

13. Which of the following is a common cause of an excessively low superheat on a TXV system...
The external equalizer could be plugged
A sensing bulb improperly connected to the suction line
A low refrigerant charge
Technician A

14. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
('Y' and 'C') and ('G' and 'C')
Flooding the condenser - cycling condenser fans - and dampering condenser air

15. Which of the following can cause excessive subcooling...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Whenever necessary
A start capacitor and a solid-state relay
An overcharged system

16. 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 blown fuse
High superheat and low discharge pressure
Run with high head and high suction pressure
A defective circuit breaker

17. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
The discharge pressure increases and the amperage increases
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A plugged filter drier
Technician A

18. Which of the following is a possible cause for a compressor to overheat...
The system has been overcharged+The system has air trapped in the condenser
Technician B
A low refrigerant charge
An increase in low-side pressure

19. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
An undercharge and low ambient conditions
Technician B
Technician B
An uninsulated TXV sensing bulb

20. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
A missing air filter+improper rotation of the indoor blower+blower too small
High suction pressure and low superheat
110-120
Technician B

21. Technician A says that if you connect 208 volts to the primary side of a 240-volt/ 24-volt transformer - the transformer will burn out. Technician B says that if you connect 208 volts to the primary side of a 240-volt/24-volt transformer - the contro
Increases starting torque
An open internal overload protector
Technician B
The sensing bulb at a lower temperature than the valve body

22. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
'G' to 'C'
Rise more than normal
Bad compressor valve
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

23. Technician A says ' When charging a system using the superheat method - adding refrigerant to the system will increase the superheat.' Technician B says 'When charging a system using the superheat method - adding refrigerant will decrease the superhe
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
The superheat increases and the subcooling decreases
A plugged filter drier
Technician B

24. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
Rise more than normal
A sensing bulb improperly connected to the suction line
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

25. When troubleshooting a split-system air conditioner - it is found that the compressor motor is humming but not starting. Technician A says that it could be an open internal overload protector. Technician B says that it could be a blown fuse. Which te
An acid-core suction line drier
Partially frosted evaporator and high superheat
Both technicians are incorrect
A vacuum test+oil traces around fittings+soap bubble solution

26. What causes the automatic expansion valve to close...
Low superheat
Technician B
An increase in low-side pressure
Technician B

27. Technician A says ' When charging a system using the superheat method - adding refrigerant to the system will increase the superheat.' Technician B says 'When charging a system using the superheat method - adding refrigerant will decrease the superhe
Current in the compressor circuit
Lack of airflow
Technician B
The oil pump pressure and the crankcase pressure

28. What are common methods that are used for leak-testing a system...
Technician B
Technician A
A vacuum test+oil traces around fittings+soap bubble solution
Dirty condenser - bent condenser fins - and air recirculating over the condenser

29. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
An uninsulated suction line and a restricted metering device
('Y' and 'C') and ('G' and 'C')
Both technicians are incorrect
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

30. A commercial customer calls complaining that her rooftop air conditioning system is not operating. The technician arrives on the job and sets the thermostat to cooling - then notices that the indoor fan is not operating. The technician then sets the

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31. The best description of a relay would be...
The sensing bulb at a lower temperature than the valve body
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Contains a solenoid coil and one or more sets of contacts
Broken rings+broken valves+seized bearings

32. What are the symptoms of an air conditioning system that has a low charge...
Partially frosted evaporator and high superheat
Evaporator and compressor
The sensing bulb at a lower temperature than the valve body
The low-side pressure will decrease and the evaporator coil will be partially frosted

33. 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
Low discharge pressure - high suction pressure - and low amp draw
The external equalizer could be plugged
Both technicians are incorrect
The discharge pressure increases and the amperage increases

34. When using a vapor-charged TXV bulb - it is necessary to have...
The sensing bulb at a lower temperature than the valve body
Bad compressor valve
Technician B
Technician B

35. What are the symptoms of a TXV air conditioning system if it has lost its charge...
The sensing bulb at a lower temperature than the valve body
High suction pressure and low superheat
The superheat will increase and the low-side pressure will decrease
An increase of air leakage from ductwork

36. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Technician B
Bad compressor valve
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Contains a solenoid coil and one or more sets of contacts

37. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
High suction pressure and low superheat
A vacuum test+oil traces around fittings+soap bubble solution
50-65
Low voltage and a faulty start relay

38. Why is it unsafe to operate an air conditioning system with a low charge...
A low refrigerant charge
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Technician A is correct
Condenser fans operating during a low ambient condition and a low suction pressure

39. What are two common symptoms of a rooftop air conditioning system that operates with a reverse-acting high-pressure control stuck in the closed position...
A blown fuse
An undercharged system+insufficient airflow over the evaporator coil
A sensing bulb improperly connected to the suction line
Condenser fans operating during a low ambient condition and a low suction pressure

40. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Low superheat
The sensing bulb at a lower temperature than the valve body
3 psig

41. What are the symptoms of an air conditioning system that has a low charge...
The low-side pressure will decrease and the evaporator coil will be partially frosted
The oil pump pressure and the crankcase pressure
'G' to 'C'
An overcharged system

42. A customer calls and says that her air conditioning system is not cooling properly. Upon arrival - a technician notices that the suction line and compressor have frost buildup. Technician A says that the problem is probably a low charge. Technician B
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
The superheat will increase and the low-side pressure will decrease
Technician B

43. A customer calls and complains that his air conditioning system is not operating properly. It is noticed that the compressor is not operating. A check on the run capacitor shows that there is 33 uf and the rating on the capacitor is 40 uf. Technician
20 to 30
Contains a solenoid coil and one or more sets of contacts
Technician B
'G' to 'C'

44. Which of the following is a possible cause for a compressor to overheat...
Technician B
The sensing bulb at a lower temperature than the valve body
High suction pressure and low superheat
A low refrigerant charge

45. What is the purpose of the TXV...
A start capacitor and a solid-state relay
Technician B
A dirty condenser - recirculation of condenser air - and a defective condenser fan
It keeps a constant superheat in the evaporator

46. What are three methods for controlling a system's high-side pressure during low ambient conditions...
The system has been overcharged+The system has air trapped in the condenser
Technician A is correct
Flooding the condenser - cycling condenser fans - and dampering condenser air
An increase in low-side pressure

47. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
50-65
Partially frosted evaporator and high superheat
It is used to control refrigerant pressure in the compressor crankcase
High suction pressure and low superheat

48. The temperature range of the suction line from an air conditioning system should be...
50-65
Both technicians are correct
A blown fuse
Short cycling and insufficient dehumidification

49. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Low voltage and a faulty start relay
Both technicians are incorrect
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

50. A technician arrives on the job and the customer complains that there is no cooling on his rooftop unit. Troubleshooting the system - the technician finds that the compressor is faulty. He notices that there is another faulty compressor laying next t
Current in the compressor circuit
Technician A
Broken rings+broken valves+seized bearings
A vacuum test+oil traces around fittings+soap bubble solution

Can you answer 50 questions in 15 minutes?

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NATE Air Conditioning Troubleshooting

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