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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. A compressor having tight bearings would cause the current value to...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Rise more than normal
The low-side pressure will decrease and the evaporator coil will be partially frosted
Both technicians are incorrect

2. A system that uses a thermal electric expansion valve...
Technician B
High superheat and low discharge pressure
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Flooding the condenser - cycling condenser fans - and dampering condenser air

3. What is the common cause of a compressor burnout...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Technician B
The oil pump pressure and the crankcase pressure
The low-side pressure will decrease and the evaporator coil will be partially frosted

4. Which of the following can cause excessive subcooling...
An undercharged system+insufficient airflow over the evaporator coil
Both technicians are incorrect
An overcharged system
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

5. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
An acid-core suction line drier
Whenever necessary
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

6. Which of the following is a possible cause for a compressor to overheat...
Bad compressor valve
A sensing bulb improperly connected to the suction line
A low refrigerant charge
An increase in suction pressure and an increase in discharge pressure

7. A restricted air filter in an air conditioning system can be identified by...
An overcharged system
It keeps a constant superheat in the evaporator
Low superheat
Rise more than normal

8. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Technician B
Technician A
Bad compressor valve
Rise more than normal

9. 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 uninsulated TXV sensing bulb
An overcharged system
Rise more than normal
Both technicians are incorrect

10. Which of the following will cause excessive discharge pressures on an air conditioning system...
Low discharge pressure - high suction pressure - and low amp draw
The sensing bulb at a lower temperature than the valve body
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A dirty condenser - recirculation of condenser air - and a defective condenser fan

11. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Bad compressor valve
An increase in suction pressure and an increase in discharge pressure
A missing air filter+improper rotation of the indoor blower+blower too small
110-120

12. 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
Condenser fans operating during a low ambient condition and a low suction pressure
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
An open internal overload protector
An overcharged system

13. 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
Technician B
A blown fuse
High superheat and low discharge pressure
An uninsulated suction line and a restricted metering device

14. What is the common cause of a compressor burnout...
The internal overload is opened
It would cause the low-side pressure to decrease
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Low voltage and a faulty start relay

15. 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
A sensing bulb improperly connected to the suction line
Whenever necessary
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Both technicians are incorrect

16. What is the purpose of an EPR valve...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
'G' to 'C'
20 to 30
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

17. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
The external equalizer could be plugged
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
It would cause the low-side pressure to decrease
20 to 30

18. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
An increase in suction pressure and an increase in discharge pressure
Condenser fans operating during a low ambient condition and a low suction pressure
Lack of airflow
Low discharge pressure - high suction pressure - and low amp draw

19. A system that is operating with a clear sight glass shows...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Bad compressor valve
The sight glass is full of liquid+the sight glass is full of gas
Low superheat

20. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
Low discharge pressure - high suction pressure - and low amp draw
A sensing bulb improperly connected to the suction line
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
3 psig

21. A customer calls with an insufficient cooling complaint on a 90
Technician B
Technician A is correct
Short cycling and insufficient dehumidification
Flooding the condenser - cycling condenser fans - and dampering condenser air

22. A restricted air filter in an air conditioning system can be identified by...
Short cycling and insufficient dehumidification
Low superheat
110-120
Flooding the condenser - cycling condenser fans - and dampering condenser air

23. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
The superheat will increase and the low-side pressure will decrease
An open internal overload protector
An uninsulated suction line and a restricted metering device
The discharge pressure increases and the amperage increases

24. What are common methods that are used for leak-testing a system...
Increases starting torque
The superheat increases and the subcooling decreases
Both technicians are incorrect
A vacuum test+oil traces around fittings+soap bubble solution

25. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Low voltage and a faulty start relay
Rise more than normal
A sensing bulb improperly connected to the suction line

26. A system that is operating with a clear sight glass shows...
Increases starting torque
The sight glass is full of liquid+the sight glass is full of gas
It keeps a constant superheat in the evaporator
A missing air filter+improper rotation of the indoor blower+blower too small

27. 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
Technician B
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Current in the compressor circuit
It would cause the low-side pressure to decrease

28. The temperature range of the suction line from an air conditioning system should be...
'G' to 'C'
Condenser fans operating during a low ambient condition and a low suction pressure
50-65
Both technicians are incorrect

29. A customer who owns a split air conditioning system complains that his system has been running but his house doesn't seem to be cooling properly. When the service technician arrives on the job - he or she finds that the indoor blower is operating and
Both technicians are incorrect
Clean the condenser coil
An uninsulated suction line and a restricted metering device
The discharge pressure increases and the amperage increases

30. 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...
The sight glass is full of liquid+the sight glass is full of gas
The internal overload is opened
Technician A is correct
Technician A is correct

31. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
A restricted metering device
High suction pressure and low superheat
A blown fuse

32. 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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33. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician B
An overcharged system

34. 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
Technician B
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
An uninsulated TXV sensing bulb
A missing air filter+improper rotation of the indoor blower+blower too small

35. Superheat is found in an air conditioning system in the...
A sensing bulb improperly connected to the suction line
An increase of air leakage from ductwork
Rise more than normal
Evaporator and compressor

36. A compressor having tight bearings would cause the current value to...
Rise more than normal
An uninsulated TXV sensing bulb
The sight glass is full of liquid+the sight glass is full of gas
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

37. A liquid-charged TXV bulb will...
Technician A
Always have some liquid present in the bulb and diaphragm
The sensing bulb at a lower temperature than the valve body
It is used to control refrigerant pressure in the compressor crankcase

38. What are common methods that are used for leak-testing a system...
Low discharge pressure - high suction pressure - and low amp draw
The system has been overcharged+The system has air trapped in the condenser
The sight glass is full of liquid+the sight glass is full of gas
A vacuum test+oil traces around fittings+soap bubble solution

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...
Both technicians are correct
Always have some liquid present in the bulb and diaphragm
Technician A is correct
Condenser fans operating during a low ambient condition and a low suction pressure

40. 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
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Both technicians are incorrect
An uninsulated suction line and a restricted metering device
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

41. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Both technicians are incorrect
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Technician B
Flooding the condenser - cycling condenser fans - and dampering condenser air

42. A customer calls with an insufficient cooling complaint on a 90
3 psig
An undercharge and low ambient conditions
Technician B
Both technicians are incorrect

43. 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
An acid-core suction line drier
Technician B
Technician B

44. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
Clean the condenser coil
Both technicians are correct
An acid-core suction line drier
Run with high head and high suction pressure

45. Which of the following could be the cause for a system's discharge and suction pressure being low...
A restricted metering device
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Lack of airflow
Increases starting torque

46. A system that uses a thermal electric expansion valve...
Condenser fans operating during a low ambient condition and a low suction pressure
('Y' and 'C') and ('G' and 'C')
'G' to 'C'
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

47. 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
Whenever necessary
Technician A
An increase in suction pressure and an increase in discharge pressure
Technician A is correct

48. 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
A restricted metering device
Technician B
Technician A is correct
Bad compressor valve

49. What are two problems that can cause an air conditioning system to have an excessively high superheat...
An overcharged system
An uninsulated suction line and a restricted metering device
Partially frosted evaporator and high superheat
The system has been overcharged+The system has air trapped in the condenser

50. The best description of a relay would be...
Low discharge pressure - high suction pressure - and low amp draw
Contains a solenoid coil and one or more sets of contacts
The oil pump pressure and the crankcase pressure
It would cause the low-side pressure to decrease

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NATE Air Conditioning Troubleshooting

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