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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 the purpose of the TXV...
It keeps a constant superheat in the evaporator
Condenser fans operating during a low ambient condition and a low suction pressure
Flooding the condenser - cycling condenser fans - and dampering condenser air
A sensing bulb improperly connected to the suction line

2. When using a vapor-charged TXV bulb - it is necessary to have...
A plugged filter drier
Whenever necessary
The discharge pressure increases and the amperage increases
The sensing bulb at a lower temperature than the valve body

3. 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
A bad thermostat
Run with high head and high suction pressure
Technician B
Clean the condenser coil

4. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
A bad thermostat
The system has been overcharged+The system has air trapped in the condenser
An undercharge and low ambient conditions
An increase in suction pressure and an increase in discharge pressure

5. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
It keeps a constant superheat in the evaporator
Technician A is correct
The superheat increases and the subcooling decreases
High suction pressure and low superheat

6. Which of the following can cause excessive subcooling...
A start relay
An undercharge and low ambient conditions
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
An overcharged system

7. A system that uses a thermal electric expansion valve...
An acid-core suction line drier
Lack of airflow
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Condenser fans operating during a low ambient condition and a low suction pressure

8. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
An uninsulated TXV sensing bulb
Technician B

9. A customer calls and complains that her high-efficiency air conditioning system is operating - but is not cooling properly. Further investigation shows that the system is using a TXV type of metering device. A subcooling check shows that the system a
A vacuum test+oil traces around fittings+soap bubble solution
Whenever necessary
The external equalizer could be plugged
Evaporator and compressor

10. 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...
High superheat and low discharge pressure
Contains a solenoid coil and one or more sets of contacts
Lack of airflow
A vacuum test+oil traces around fittings+soap bubble solution

11. When using a vapor-charged TXV bulb - it is necessary to have...
Contains a solenoid coil and one or more sets of contacts
Technician B
The sensing bulb at a lower temperature than the valve body
A blown fuse

12. A hard-start kit for an air conditioning system...
Increases starting torque
An undercharged system+insufficient airflow over the evaporator coil
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Bad compressor valve

13. 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...
An open internal overload protector
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Technician B
The internal overload is opened

14. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
The low-side pressure will decrease and the evaporator coil will be partially frosted
A low refrigerant charge
Low discharge pressure - high suction pressure - and low amp draw
Technician A is correct

15. What problem can cause an increase of discharge pressure and an increase of suction pressure...
An overcharged system
It is used to control refrigerant pressure in the compressor crankcase
It would cause the low-side pressure to decrease
It keeps a constant superheat in the evaporator

16. 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
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Technician B

17. 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
Technician B
A blown fuse
('Y' and 'C') and ('G' and 'C')

18. A customer calls and complains that her high-efficiency air conditioning system is operating - but is not cooling properly. Further investigation shows that the system is using a TXV type of metering device. A subcooling check shows that the system a
The external equalizer could be plugged
The sensing bulb at a lower temperature than the valve body
Technician B
The sensing bulb at a lower temperature than the valve body

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...
Low voltage and a faulty start relay
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Both technicians are incorrect
It keeps a constant superheat in the evaporator

20. The internal overload of an air conditioning compressor senses winding temperature and...
Flooding the condenser - cycling condenser fans - and dampering condenser air
A dirty condenser - recirculation of condenser air - and a defective condenser fan
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

21. What are the symptoms of an air conditioning system that has a low charge...
A low refrigerant charge
The low-side pressure will decrease and the evaporator coil will be partially frosted
An increase of air leakage from ductwork
3 psig

22. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
Technician A is correct
High suction pressure and low superheat
Bad compressor valve
Technician A

23. 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
Technician A
Low voltage and a faulty start relay
110-120
Technician B

24. 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
Evaporator and compressor
An open internal overload protector
Technician B
Technician B

25. 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
Technician B
An increase in low-side pressure
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Both technicians are incorrect

26. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
Increases starting torque
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Whenever necessary

27. A compressor having tight bearings would cause the current value to...
Rise more than normal
Condenser fans operating during a low ambient condition and a low suction pressure
The external equalizer could be plugged
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

28. A system that is operating with a clear sight glass shows...
Technician A is correct
The sensing bulb at a lower temperature than the valve body
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The sight glass is full of liquid+the sight glass is full of gas

29. 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
A low refrigerant charge
A defective circuit breaker
The system has been overcharged+The system has air trapped in the condenser
Technician B

30. 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
A defective circuit breaker
Both technicians are correct
Contains a solenoid coil and one or more sets of contacts
50-65

31. What are common methods that are used for leak-testing a system...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A vacuum test+oil traces around fittings+soap bubble solution
Evaporator and compressor
An increase in low-side pressure

32. What is the purpose of an EPR valve...
Technician B
The sight glass is full of liquid+the sight glass is full of gas
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
3 psig

33. 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 increase in suction pressure and an increase in discharge pressure
Both technicians are incorrect
Technician B
An acid-core suction line drier

34. Which of the following is a possible cause for a compressor to overheat...
An increase in low-side pressure
It keeps a constant superheat in the evaporator
High superheat and low discharge pressure
A low refrigerant charge

35. What are two common symptoms of refrigerant leaks in an air conditioning system...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A sensing bulb improperly connected to the suction line
Contains a solenoid coil and one or more sets of contacts
Partially frosted evaporator and high superheat

36. The best description of a relay would be...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Run with high head and high suction pressure
A start relay
Contains a solenoid coil and one or more sets of contacts

37. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
Technician B
The internal overload is opened
3 psig
A missing air filter+improper rotation of the indoor blower+blower too small

38. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Technician A is correct
An undercharged system+insufficient airflow over the evaporator coil
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
('Y' and 'C') and ('G' and 'C')

39. 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 incorrect
The external equalizer could be plugged
Low voltage and a faulty start relay
Technician B

40. 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...
High superheat and low discharge pressure
Low voltage and a faulty start relay
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
('Y' and 'C') and ('G' and 'C')

41. 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...
Condenser fans operating during a low ambient condition and a low suction pressure
The external equalizer could be plugged
The internal overload is opened
A missing air filter+improper rotation of the indoor blower+blower too small

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
110-120
A blown fuse
Technician B
A low refrigerant charge

43. Which of the following will cause excessive discharge pressures on an air conditioning system...
Whenever necessary
Technician B
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
The superheat increases and the subcooling decreases

44. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Lack of airflow
110-120
Dirty condenser - bent condenser fins - and air recirculating over the condenser
A start relay

45. 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...
Condenser fans operating during a low ambient condition and a low suction pressure
Technician B
Always have some liquid present in the bulb and diaphragm
Low discharge pressure - high suction pressure - and low amp draw

46. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Bad compressor valve
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
A blown fuse

47. 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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48. Why is it unsafe to operate an air conditioning system with a low charge...
3 psig
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
An undercharge and low ambient conditions

49. 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
The superheat will increase and the low-side pressure will decrease
It is used to control refrigerant pressure in the compressor crankcase
Whenever necessary

50. Which of the following will cause excessive discharge pressures on an air conditioning system...
The system has been overcharged+The system has air trapped in the condenser
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Technician B
A dirty condenser - recirculation of condenser air - and a defective condenser fan

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NATE Air Conditioning Troubleshooting

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