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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. 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
Both technicians are correct
High suction pressure and low superheat
Low discharge pressure - high suction pressure - and low amp draw

2. A party-store owner tried to adjust the water valve on his water-cooled condensing unit - then he called for assistance from an HVAC/are service technician. It was found that when servicing the unit - the outlet water temperature was too low. Technic
Both technicians are correct
A missing air filter+improper rotation of the indoor blower+blower too small
A restricted metering device
Technician B

3. 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
Technician B
A plugged filter drier
Both technicians are correct
An acid-core suction line drier

4. 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 dirty condenser - recirculation of condenser air - and a defective condenser fan
High superheat and low discharge pressure
Both technicians are incorrect
An open internal overload protector

5. Which of the following will cause excessive discharge pressures on an air conditioning system...
The discharge pressure increases and the amperage increases
A restricted metering device
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Short cycling and insufficient dehumidification

6. A customer calls with an insufficient cooling complaint on a 90
Always have some liquid present in the bulb and diaphragm
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Technician B
Whenever necessary

7. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Technician B
Contains a solenoid coil and one or more sets of contacts
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Whenever necessary

8. Which of the following will cause excessive discharge pressures on an air conditioning system...
Technician B
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Flooding the condenser - cycling condenser fans - and dampering condenser air

9. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
A missing air filter+improper rotation of the indoor blower+blower too small
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Run with high head and high suction pressure
Technician A

10. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
An uninsulated suction line and a restricted metering device
Increases starting torque
Low discharge pressure - high suction pressure - and low amp draw
A low refrigerant charge

11. 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...
Low voltage and a faulty start relay
Condenser fans operating during a low ambient condition and a low suction pressure
50-65
Contains a solenoid coil and one or more sets of contacts

12. A hard-start kit consists of...
Flooding the condenser - cycling condenser fans - and dampering condenser air
A start capacitor and a solid-state relay
Technician B
Technician B

13. Which of the following is a common cause of an excessively low superheat on a TXV system...
It would cause the low-side pressure to decrease
A start relay
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

14. A restricted air filter in an air conditioning system can be identified by...
Technician A is correct
An increase of air leakage from ductwork
Technician B
Low superheat

15. What are the symptoms of an air conditioning system that has a low charge...
An increase of air leakage from ductwork
It would cause the low-side pressure to decrease
The low-side pressure will decrease and the evaporator coil will be partially frosted
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

16. A system that uses a thermal electric expansion valve...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Technician A is correct
50-65

17. What component is most often the cause of a start capacitor failure...
A bad thermostat
Low voltage and a faulty start relay
A start relay
Short cycling and insufficient dehumidification

18. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Run with high head and high suction pressure
An undercharged system+insufficient airflow over the evaporator coil
Technician B

19. 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...
Condenser fans operating during a low ambient condition and a low suction pressure
The low-side pressure will decrease and the evaporator coil will be partially frosted
High superheat and low discharge pressure
50-65

20. A system that is operating with a clear sight glass shows...
Low voltage and a faulty start relay
The sight glass is full of liquid+the sight glass is full of gas
An open internal overload protector
The internal overload is opened

21. 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...
The internal overload is opened
Condenser fans operating during a low ambient condition and a low suction pressure
A restricted metering device
Run with high head and high suction pressure

22. A party-store owner tried to adjust the water valve on his water-cooled condensing unit - then he called for assistance from an HVAC/are service technician. It was found that when servicing the unit - the outlet water temperature was too low. Technic
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Low discharge pressure - high suction pressure - and low amp draw
Technician B
A vacuum test+oil traces around fittings+soap bubble solution

23. A commercial customer calls on a 90
A bad thermostat
The system has been overcharged+The system has air trapped in the condenser
The superheat increases and the subcooling decreases
Partially frosted evaporator and high superheat

24. 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
Contains a solenoid coil and one or more sets of contacts
Both technicians are incorrect
The internal overload is opened
The low-side pressure will decrease and the evaporator coil will be partially frosted

25. A compressor motor starts and operates for a short period of time and cycles on the external overload protector. What are two possible problems that could cause this...
Low voltage and a faulty start relay
Technician B
The superheat will increase and the low-side pressure will decrease
The system has been overcharged+The system has air trapped in the condenser

26. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
The superheat increases and the subcooling decreases
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
The low-side pressure will decrease and the evaporator coil will be partially frosted
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

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
The discharge pressure increases and the amperage increases
Technician B
Run with high head and high suction pressure
Increases starting torque

28. 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 discharge pressure - high suction pressure - and low amp draw
Contains a solenoid coil and one or more sets of contacts
('Y' and 'C') and ('G' and 'C')

29. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
An increase in suction pressure and an increase in discharge pressure
Current in the compressor circuit
An open internal overload protector
An increase in low-side pressure

30. Why is it unsafe to operate an air conditioning system with a low charge...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Whenever necessary
Technician B
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

31. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
The system has been overcharged+The system has air trapped in the condenser
Condenser fans operating during a low ambient condition and a low suction pressure
It would cause the low-side pressure to decrease
A start relay

32. A customer calls with an insufficient cooling complaint on a 90
The system has been overcharged+The system has air trapped in the condenser
Technician B
3 psig
An increase of air leakage from ductwork

33. A commercial customer calls on a 90
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
The system has been overcharged+The system has air trapped in the condenser
An uninsulated suction line and a restricted metering device
Technician A

34. What are the operating pressures of an oil pressure safety switch...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
3 psig
The oil pump pressure and the crankcase pressure
Clean the condenser coil

35. What are two common symptoms of refrigerant leaks in an air conditioning system...
Partially frosted evaporator and high superheat
A missing air filter+improper rotation of the indoor blower+blower too small
Technician B
The superheat increases and the subcooling decreases

36. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Lack of airflow
Technician B
Technician B
Whenever necessary

37. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
High suction pressure and low superheat
The discharge pressure increases and the amperage increases
An overcharged system
Lack of airflow

38. Which of the following can cause excessive subcooling...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An overcharged system
50-65
Both technicians are incorrect

39. What three things can prevent an air conditioning system from releasing heat at the proper rate...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Current in the compressor circuit
Low voltage and a faulty start relay
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

40. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
An undercharge and low ambient conditions
Both technicians are incorrect
An open internal overload protector
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

41. What are two problems that can cause an air conditioning system to have an excessively high superheat...
The system has been overcharged+The system has air trapped in the condenser
An uninsulated suction line and a restricted metering device
'G' to 'C'
An open internal overload protector

42. Which of the following could be the cause for a system's discharge and suction pressure being low...
An undercharged system+insufficient airflow over the evaporator coil
An open internal overload protector
The discharge pressure increases and the amperage increases
A restricted metering device

43. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
Run with high head and high suction pressure
Both technicians are incorrect
The superheat will increase and the low-side pressure will decrease
An increase in suction pressure and an increase in discharge pressure

44. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
A plugged filter drier
The discharge pressure increases and the amperage increases
An acid-core suction line drier
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

45. The internal overload of an air conditioning compressor senses winding temperature and...
An uninsulated TXV sensing bulb
Run with high head and high suction pressure
Clean the condenser coil
Current in the compressor circuit

46. What are two problems that can cause an air conditioning system to have an excessively high superheat...
An uninsulated suction line and a restricted metering device
Both technicians are correct
Contains a solenoid coil and one or more sets of contacts
An increase of air leakage from ductwork

47. 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
Broken rings+broken valves+seized bearings
It would cause the low-side pressure to decrease
('Y' and 'C') and ('G' and 'C')
Increases starting torque

48. What is the purpose of an EPR valve...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
'G' to 'C'
Always have some liquid present in the bulb and diaphragm
A low refrigerant charge

49. The best description of a relay would be...
The low-side pressure will decrease and the evaporator coil will be partially frosted
Flooding the condenser - cycling condenser fans - and dampering condenser air
Contains a solenoid coil and one or more sets of contacts
Technician B

50. What is the purpose of an EPR valve...
Always have some liquid present in the bulb and diaphragm
A dirty condenser - recirculation of condenser air - and a defective condenser fan
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A blown fuse

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NATE Air Conditioning Troubleshooting

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