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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. 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
Low superheat
Both technicians are incorrect
3 psig
The sight glass is full of liquid+the sight glass is full of gas

2. 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
An overcharged system
Run with high head and high suction pressure
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

3. A liquid-charged TXV bulb will...
Always have some liquid present in the bulb and diaphragm
The sensing bulb at a lower temperature than the valve body
3 psig
An undercharged system+insufficient airflow over the evaporator coil

4. 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...
Technician A
A sensing bulb improperly connected to the suction line
Condenser fans operating during a low ambient condition and a low suction pressure
A defective circuit breaker

5. A restricted air filter in an air conditioning system can be identified by...
Both technicians are incorrect
Low superheat
A restricted metering device
The sensing bulb at a lower temperature than the valve body

6. 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
The superheat will increase and the low-side pressure will decrease
The sensing bulb at a lower temperature than the valve body
An increase of air leakage from ductwork

7. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
An overcharged system
It would cause the low-side pressure to decrease
3 psig
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

8. Which of the following will cause excessive discharge pressures on an air conditioning system...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
An uninsulated suction line and a restricted metering device
A low refrigerant charge
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

9. Insufficient airflow can be caused by...
Evaporator and compressor
A blown fuse
An increase of air leakage from ductwork
Technician B

10. What is the purpose of an EPR valve...
It would cause the low-side pressure to decrease
Technician A is correct
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
An uninsulated suction line and a restricted metering device

11. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
The oil pump pressure and the crankcase pressure
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Broken rings+broken valves+seized bearings

12. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Technician B
3 psig
20 to 30

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...
The internal overload is opened
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A bad thermostat
An open internal overload protector

14. 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
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Increases starting torque
Technician B

15. 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
The sensing bulb at a lower temperature than the valve body
Technician B
Contains a solenoid coil and one or more sets of contacts

16. 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
A bad thermostat
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Contains a solenoid coil and one or more sets of contacts
Current in the compressor circuit

17. A hard-start kit for an air conditioning system...
('Y' and 'C') and ('G' and 'C')
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Increases starting torque
Short cycling and insufficient dehumidification

18. When using a vapor-charged TXV bulb - it is necessary to have...
Technician B
A sensing bulb improperly connected to the suction line
Low discharge pressure - high suction pressure - and low amp draw
The sensing bulb at a lower temperature than the valve body

19. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
An undercharged system+insufficient airflow over the evaporator coil
50-65
A missing air filter+improper rotation of the indoor blower+blower too small
It keeps a constant superheat in the evaporator

20. 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 missing air filter+improper rotation of the indoor blower+blower too small
Lack of airflow
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Both technicians are incorrect

21. What is the purpose of the TXV...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
It keeps a constant superheat in the evaporator
A plugged filter drier
A low refrigerant charge

22. 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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23. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
High superheat and low discharge pressure
An uninsulated TXV sensing bulb
Clean the condenser coil

24. A commercial customer calls on a 90
The superheat increases and the subcooling decreases
A plugged filter drier
Both technicians are incorrect
The system has been overcharged+The system has air trapped in the condenser

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
Contains a solenoid coil and one or more sets of contacts
The external equalizer could be plugged
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

26. Air filters should be replaced...
The sensing bulb at a lower temperature than the valve body
Whenever necessary
20 to 30
An increase in low-side pressure

27. What problem or problems can cause low discharge and suction pressure...
Technician B
'G' to 'C'
Current in the compressor circuit
An undercharged system+insufficient airflow over the evaporator coil

28. What are two common symptoms of refrigerant leaks in an air conditioning system...
An overcharged system
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Partially frosted evaporator and high superheat
'G' to 'C'

29. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Lack of airflow
Increases starting torque
An overcharged system

30. The best description of a relay would be...
Contains a solenoid coil and one or more sets of contacts
An open internal overload protector
The superheat increases and the subcooling decreases
A start capacitor and a solid-state relay

31. What problem or problems can cause low discharge and suction pressure...
An undercharged system+insufficient airflow over the evaporator coil
It is used to control refrigerant pressure in the compressor crankcase
The external equalizer could be plugged
Both technicians are correct

32. Insufficient airflow can be caused by...
Technician B
50-65
A restricted metering device
An increase of air leakage from ductwork

33. 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
The sensing bulb at a lower temperature than the valve body
Technician B
Both technicians are incorrect

34. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
110-120
The system has been overcharged+The system has air trapped in the condenser
Technician A
A bad thermostat

35. A compressor having tight bearings would cause the current value to...
Technician A
A defective circuit breaker
Technician B
Rise more than normal

36. Which of the following is a possible cause for a compressor to overheat...
Contains a solenoid coil and one or more sets of contacts
A defective circuit breaker
Low voltage and a faulty start relay
A low refrigerant charge

37. 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
Technician B
A plugged filter drier
A start relay
An increase in low-side pressure

38. A system that uses a thermal electric expansion valve...
The discharge pressure increases and the amperage increases
A blown fuse
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An acid-core suction line drier

39. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
A plugged filter drier
An increase in low-side pressure
110-120
It is used to control refrigerant pressure in the compressor crankcase

40. 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
It is used to control refrigerant pressure in the compressor crankcase
A bad thermostat
Low discharge pressure - high suction pressure - and low amp draw
The internal overload is opened

41. 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
3 psig
Technician B
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

42. 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 A
The external equalizer could be plugged
Technician B
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

43. What problem can cause an increase of discharge pressure and an increase of suction pressure...
3 psig
An overcharged system
Technician B
An increase in low-side pressure

44. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
A blown fuse
The system has been overcharged+The system has air trapped in the condenser
It keeps a constant superheat in the evaporator
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

45. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
An increase in low-side pressure
Low voltage and a faulty start relay
Technician A
A plugged filter drier

46. Air filters should be replaced...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Whenever necessary
Both technicians are incorrect
A dirty condenser - recirculation of condenser air - and a defective condenser fan

47. What are three methods for controlling a system's high-side pressure during low ambient conditions...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An undercharged system+insufficient airflow over the evaporator coil
Technician B
Flooding the condenser - cycling condenser fans - and dampering condenser air

48. What are the symptoms of a TXV air conditioning system if it has lost its charge...
Partially frosted evaporator and high superheat
The superheat increases and the subcooling decreases
High superheat and low discharge pressure
The superheat will increase and the low-side pressure will decrease

49. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Rise more than normal
An open internal overload protector
A sensing bulb improperly connected to the suction line
Bad compressor valve

50. 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
An open internal overload protector
Technician B
Condenser fans operating during a low ambient condition and a low suction pressure
An overcharged system

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NATE Air Conditioning Troubleshooting

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