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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. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
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
Technician B
Dirty condenser - bent condenser fins - and air recirculating over the condenser

2. 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
Technician B
('Y' and 'C') and ('G' and 'C')
An open internal overload protector
The superheat increases and the subcooling decreases

3. A compressor having tight bearings would cause the current value to...
A blown fuse
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Rise more than normal
Technician B

4. Which of the following is a common cause of an excessively low superheat on a TXV system...
A sensing bulb improperly connected to the suction line
Condenser fans operating during a low ambient condition and a low suction pressure
Technician B
It would cause the low-side pressure to decrease

5. What are common methods that are used for leak-testing a system...
A vacuum test+oil traces around fittings+soap bubble solution
A restricted metering device
A restricted metering device
The sensing bulb at a lower temperature than the valve body

6. What is the purpose of a CPR valve...
A restricted metering device
The low-side pressure will decrease and the evaporator coil will be partially frosted
It is used to control refrigerant pressure in the compressor crankcase
Rise more than normal

7. A system that uses a thermal electric expansion valve...
Increases starting torque
An uninsulated TXV sensing bulb
It is used to control refrigerant pressure in the compressor crankcase
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

8. Which of the following can cause low superheat in a TXV system...
'G' to 'C'
An undercharged system+insufficient airflow over the evaporator coil
An uninsulated TXV sensing bulb
Both technicians are incorrect

9. Which of the following could be the cause for a system's discharge and suction pressure being low...
An increase in suction pressure and an increase in discharge pressure
A restricted metering device
Rise more than normal
Low superheat

10. Why is it unsafe to operate an air conditioning system with a low charge...
Technician B
An increase in low-side pressure
It keeps a constant superheat in the evaporator
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

11. What problem can cause an increase of discharge pressure and an increase of suction pressure...
An acid-core suction line drier
('Y' and 'C') and ('G' and 'C')
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
An overcharged system

12. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
Technician B
Always have some liquid present in the bulb and diaphragm
An increase in suction pressure and an increase in discharge pressure
Technician B

13. 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
Technician A is correct
Contains a solenoid coil and one or more sets of contacts
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

14. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
A bad thermostat
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
The internal overload is opened
An undercharge and low ambient conditions

15. A 220-volt 30-amp motor circuit keeps tripping the breaker after the motor is started. The starting amperage is 60 amps. When measuring the amperage of the circuit - This is drawn for a brief moment. After startup - the amperage drops to 22 amps and
Technician B
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A defective circuit breaker
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

16. Which of the following could be the cause for a system's discharge and suction pressure being low...
Flooding the condenser - cycling condenser fans - and dampering condenser air
An uninsulated TXV sensing bulb
A restricted metering device
Always have some liquid present in the bulb and diaphragm

17. Which of the following can cause excessive subcooling...
It keeps a constant superheat in the evaporator
An overcharged system
Bad compressor valve
Technician B

18. What type of problems can be caused by an oversized air conditioning system...
A start relay
High superheat and low discharge pressure
Short cycling and insufficient dehumidification
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

19. 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...
A restricted metering device
An uninsulated suction line and a restricted metering device
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Low voltage and a faulty start relay

20. 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
Contains a solenoid coil and one or more sets of contacts
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

21. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
A blown fuse
Condenser fans operating during a low ambient condition and a low suction pressure
An undercharge and low ambient conditions
A vacuum test+oil traces around fittings+soap bubble solution

22. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
An acid-core suction line drier
A plugged filter drier
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A restricted metering device

23. Which of the following can cause excessive subcooling...
'G' to 'C'
An undercharge and low ambient conditions
Dirty condenser - bent condenser fins - and air recirculating over the condenser
An overcharged system

24. A system that is operating with a clear sight glass shows...
3 psig
The sight glass is full of liquid+the sight glass is full of gas
Technician B
The oil pump pressure and the crankcase pressure

25. 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
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
110-120
The internal overload is opened

26. Which of the following is a possible cause for a compressor to overheat...
A missing air filter+improper rotation of the indoor blower+blower too small
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A low refrigerant charge
The system has been overcharged+The system has air trapped in the condenser

27. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
The discharge pressure increases and the amperage increases
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An undercharge and low ambient conditions

28. A commercial customer calls on a 90
Technician B
High suction pressure and low superheat
Evaporator and compressor
The system has been overcharged+The system has air trapped in the condenser

29. A system that is being serviced has been evacuated down to 500 microns. When the gauges are closed and the vacuum pump is turned off - the pressure starts to increase and stops at 1000 microns. Technician A says that the system has a leak and needs t
Broken rings+broken valves+seized bearings
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Short cycling and insufficient dehumidification
Technician B

30. What are two common symptoms of refrigerant leaks in an air conditioning system...
A restricted metering device
Evaporator and compressor
Partially frosted evaporator and high superheat
It would cause the low-side pressure to decrease

31. Insufficient airflow can be caused by...
Technician B
Dirty condenser - bent condenser fins - and air recirculating over the condenser
An increase of air leakage from ductwork
The superheat will increase and the low-side pressure will decrease

32. Air filters should be replaced...
Whenever necessary
('Y' and 'C') and ('G' and 'C')
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
A start capacitor and a solid-state relay

33. What component is most often the cause of a start capacitor failure...
Flooding the condenser - cycling condenser fans - and dampering condenser air
A start relay
Technician B
The oil pump pressure and the crankcase pressure

34. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
A blown fuse
A start capacitor and a solid-state relay
The superheat increases and the subcooling decreases
20 to 30

35. What causes the automatic expansion valve to close...
Technician A
An overcharged system
An increase in low-side pressure
Technician B

36. 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
20 to 30
Contains a solenoid coil and one or more sets of contacts
The discharge pressure increases and the amperage increases

37. What is the purpose of an EPR valve...
A low refrigerant charge
A restricted metering device
The discharge pressure increases and the amperage increases
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

38. 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 low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
High superheat and low discharge pressure
High suction pressure and low superheat

39. A hard-start kit for an air conditioning system...
An overcharged system
A restricted metering device
Rise more than normal
Increases starting torque

40. 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
50-65
An increase in suction pressure and an increase in discharge pressure
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Broken rings+broken valves+seized bearings

41. 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 restricted metering device
Both technicians are incorrect
Partially frosted evaporator and high superheat
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

42. A liquid-charged TXV bulb will...
Technician A is correct
Always have some liquid present in the bulb and diaphragm
A bad thermostat
An open internal overload protector

43. 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 uninsulated TXV sensing bulb
Both technicians are correct
Technician A
It would cause the low-side pressure to decrease

44. 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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45. A restricted air filter in an air conditioning system can be identified by...
Rise more than normal
An open internal overload protector
Low superheat
An uninsulated suction line and a restricted metering device

46. 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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47. What are two common symptoms of refrigerant leaks in an air conditioning system...
('Y' and 'C') and ('G' and 'C')
The superheat increases and the subcooling decreases
Partially frosted evaporator and high superheat
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

48. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
Technician A is correct
The system has been overcharged+The system has air trapped in the condenser
It would cause the low-side pressure to decrease
An acid-core suction line drier

49. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
A start relay
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Technician B
Low superheat

50. 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
Technician B
The low-side pressure will decrease and the evaporator coil will be partially frosted
A bad thermostat
Technician A

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NATE Air Conditioning Troubleshooting

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