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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 system that uses a thermal electric expansion valve...
An overcharged system
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
Low voltage and a faulty start relay

2. 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
An acid-core suction line drier
It would cause the low-side pressure to decrease
Condenser fans operating during a low ambient condition and a low suction pressure
A bad thermostat

3. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
The discharge pressure increases and the amperage increases
Always have some liquid present in the bulb and diaphragm
High superheat and low discharge pressure
Technician B

4. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Low discharge pressure - high suction pressure - and low amp draw
Rise more than normal
Lack of airflow
Technician A is correct

5. Superheat is found in an air conditioning system in the...
An uninsulated suction line and a restricted metering device
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
A defective circuit breaker
Evaporator and compressor

6. 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
An undercharge and low ambient conditions
Low superheat
Technician B
Lack of airflow

7. 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
Contains a solenoid coil and one or more sets of contacts
Low superheat

8. What type of problems can be caused by an oversized air conditioning system...
It is used to control refrigerant pressure in the compressor crankcase
Low superheat
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

9. What type of problems can be caused by an oversized air conditioning system...
Bad compressor valve
Short cycling and insufficient dehumidification
A bad thermostat
The superheat will increase and the low-side pressure will decrease

10. 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
Low discharge pressure - high suction pressure - and low amp draw
Always have some liquid present in the bulb and diaphragm
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

11. 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
Both technicians are incorrect
Rise more than normal

12. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
Flooding the condenser - cycling condenser fans - and dampering condenser air
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
('Y' and 'C') and ('G' and 'C')
The sight glass is full of liquid+the sight glass is full of gas

13. A liquid-charged TXV bulb will...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Always have some liquid present in the bulb and diaphragm
It keeps a constant superheat in the evaporator
The superheat will increase and the low-side pressure will decrease

14. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
An undercharge and low ambient conditions
It keeps a constant superheat in the evaporator
High superheat and low discharge pressure
A vacuum test+oil traces around fittings+soap bubble solution

15. 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
An overcharged system
Technician B
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

16. Superheat is found in an air conditioning system in the...
An uninsulated TXV sensing bulb
A missing air filter+improper rotation of the indoor blower+blower too small
Whenever necessary
Evaporator and compressor

17. The temperature range of the suction line from an air conditioning system should be...
The internal overload is opened
Both technicians are incorrect
High suction pressure and low superheat
50-65

18. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
The external equalizer could be plugged
The system has been overcharged+The system has air trapped in the condenser
Low discharge pressure - high suction pressure - and low amp draw
It keeps a constant superheat in the evaporator

19. 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
The superheat will increase and the low-side pressure will decrease
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Always have some liquid present in the bulb and diaphragm

20. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Always have some liquid present in the bulb and diaphragm
Low voltage and a faulty start relay
A plugged filter drier
Bad compressor valve

21. 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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22. A restricted air filter in an air conditioning system can be identified by...
It is used to control refrigerant pressure in the compressor crankcase
3 psig
Low superheat
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

23. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
3 psig
An uninsulated TXV sensing bulb
A vacuum test+oil traces around fittings+soap bubble solution

24. 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...
Short cycling and insufficient dehumidification
Low voltage and a faulty start relay
3 psig
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

25. 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
Technician B
A restricted metering device
Both technicians are incorrect
The discharge pressure increases and the amperage increases

26. 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
The system has been overcharged+The system has air trapped in the condenser
An increase in low-side pressure
High suction pressure and low superheat
Technician B

27. What are two problems that can cause an air conditioning system to have an excessively high superheat...
An increase in suction pressure and an increase in discharge pressure
An uninsulated suction line and a restricted metering device
Always have some liquid present in the bulb and diaphragm
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

28. The temperature range of the suction line from an air conditioning system should be...
50-65
Always have some liquid present in the bulb and diaphragm
Technician B
The internal overload is opened

29. A commercial customer calls on a 90
50-65
Technician B
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
The system has been overcharged+The system has air trapped in the condenser

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
An increase of air leakage from ductwork
Technician B
Both technicians are correct
A plugged filter drier

31. A restricted air filter in an air conditioning system can be identified by...
50-65
An uninsulated suction line and a restricted metering device
An undercharge and low ambient conditions
Low superheat

32. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
A start relay
A plugged filter drier
An uninsulated suction line and a restricted metering device
Whenever necessary

33. Why is it unsafe to operate an air conditioning system with a low charge...
Both technicians are incorrect
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
An acid-core suction line drier
Whenever necessary

34. What are common methods that are used for leak-testing a system...
Increases starting torque
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
An open internal overload protector
A vacuum test+oil traces around fittings+soap bubble solution

35. A hard-start kit for an air conditioning system...
A start relay
Partially frosted evaporator and high superheat
Increases starting torque
The oil pump pressure and the crankcase pressure

36. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Current in the compressor circuit
An uninsulated suction line and a restricted metering device
Evaporator and compressor
Bad compressor valve

37. 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
An increase in low-side pressure
An open internal overload protector
An undercharge and low ambient conditions

38. A compressor having tight bearings would cause the current value to...
High suction pressure and low superheat
Rise more than normal
A sensing bulb improperly connected to the suction line
3 psig

39. 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
It keeps a constant superheat in the evaporator
It keeps a constant superheat in the evaporator
Both technicians are incorrect
A bad thermostat

40. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Technician B
Low voltage and a faulty start relay
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Dirty condenser - bent condenser fins - and air recirculating over the condenser

41. 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
Lack of airflow
Condenser fans operating during a low ambient condition and a low suction pressure
An increase in low-side pressure

42. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
An uninsulated TXV sensing bulb
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Technician B
Short cycling and insufficient dehumidification

43. What causes the automatic expansion valve to close...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Technician B
An increase in low-side pressure
Technician B

44. Which of the following is a possible cause for a compressor to overheat...
Technician B
Technician B
A low refrigerant charge
The oil pump pressure and the crankcase pressure

45. Which of the following will cause excessive discharge pressures on an air conditioning system...
A start capacitor and a solid-state relay
High superheat and low discharge pressure
Rise more than normal
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

46. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
High suction pressure and low superheat
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician B
Dirty condenser - bent condenser fins - and air recirculating over the condenser

47. 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
A missing air filter+improper rotation of the indoor blower+blower too small
Technician B
3 psig

48. Why is it unsafe to operate an air conditioning system with a low charge...
Both technicians are correct
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
An increase in suction pressure and an increase in discharge pressure
Both technicians are incorrect

49. 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
An uninsulated TXV sensing bulb
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Technician B

50. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
Lack of airflow
An increase in suction pressure and an increase in discharge pressure
Technician A is correct
Partially frosted evaporator and high superheat

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NATE Air Conditioning Troubleshooting

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