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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...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Technician B
A start capacitor and a solid-state relay
Bad compressor valve

2. Insufficient airflow can be caused by...
Technician B
An increase of air leakage from ductwork
Broken rings+broken valves+seized bearings
Technician A

3. 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
Increases starting torque
Flooding the condenser - cycling condenser fans - and dampering condenser air
A blown fuse
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

4. If 24 volts are present to the contactor coil on an air conditioning system and the condenser fan or compressor is inoperative - which of the following could be at fault...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A blown fuse
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
An increase in low-side pressure

5. 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 bad thermostat
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
A start capacitor and a solid-state relay
Low voltage and a faulty start relay

6. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
Current in the compressor circuit
An undercharge and low ambient conditions
Broken rings+broken valves+seized bearings
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

7. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
A blown fuse
A plugged filter drier
A vacuum test+oil traces around fittings+soap bubble solution
3 psig

8. What three things can prevent an air conditioning system from releasing heat at the proper rate...
A defective circuit breaker
A dirty condenser - recirculation of condenser air - and a defective condenser fan
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Low voltage and a faulty start relay

9. What type of problems can be caused by an oversized air conditioning system...
The internal overload is opened
Condenser fans operating during a low ambient condition and a low suction pressure
Short cycling and insufficient dehumidification
Condenser fans operating during a low ambient condition and a low suction pressure

10. What are two common symptoms of refrigerant leaks in an air conditioning system...
Partially frosted evaporator and high superheat
Technician A is correct
110-120
Dirty condenser - bent condenser fins - and air recirculating over the condenser

11. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
The internal overload is opened
An increase in suction pressure and an increase in discharge pressure
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

12. 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 dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Broken rings+broken valves+seized bearings
('Y' and 'C') and ('G' and 'C')
An acid-core suction line drier

13. 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
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An acid-core suction line drier
Technician B

14. 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 overcharged system
Rise more than normal
A start capacitor and a solid-state relay

15. 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
A dirty condenser - recirculation of condenser air - and a defective condenser fan
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

16. Which of the following could be the cause for a system's discharge and suction pressure being low...
A blown fuse
A restricted metering device
Increases starting torque
Technician B

17. What are three methods for controlling a system's high-side pressure during low ambient conditions...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Flooding the condenser - cycling condenser fans - and dampering condenser air
Both technicians are incorrect
Technician B

18. Why is it unsafe to operate an air conditioning system with a low charge...
A sensing bulb improperly connected to the suction line
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A bad thermostat

19. When using a vapor-charged TXV bulb - it is necessary to have...
An overcharged system
The sensing bulb at a lower temperature than the valve body
A missing air filter+improper rotation of the indoor blower+blower too small
High superheat and low discharge pressure

20. A system that is operating with a clear sight glass shows...
Always have some liquid present in the bulb and diaphragm
An increase in low-side pressure
The sight glass is full of liquid+the sight glass is full of gas
'G' to 'C'

21. A customer who owns a split air conditioning system complains that his system has been running but his house doesn't seem to be cooling properly. When the service technician arrives on the job - he or she finds that the indoor blower is operating and
Technician B
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Clean the condenser coil
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

22. A system that uses a thermal electric expansion valve...
Bad compressor valve
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Lack of airflow
The external equalizer could be plugged

23. What are the operating pressures of an oil pressure safety switch...
Both technicians are correct
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A sensing bulb improperly connected to the suction line
The oil pump pressure and the crankcase pressure

24. 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
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Clean the condenser coil

25. The best description of a relay would be...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Technician B
Contains a solenoid coil and one or more sets of contacts
Both technicians are incorrect

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
Clean the condenser coil
An uninsulated suction line and a restricted metering device
Technician B
Rise more than normal

27. A system that is operating with a clear sight glass shows...
An increase in low-side pressure
The sight glass is full of liquid+the sight glass is full of gas
Rise more than normal
50-65

28. Which of the following is a common cause of an excessively low superheat on a TXV system...
A missing air filter+improper rotation of the indoor blower+blower too small
Lack of airflow
The oil pump pressure and the crankcase pressure
A sensing bulb improperly connected to the suction line

29. 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
Clean the condenser coil
The superheat will increase and the low-side pressure will decrease
Technician A
Technician B

30. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
The superheat will increase and the low-side pressure will decrease
High suction pressure and low superheat
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
It is used to control refrigerant pressure in the compressor crankcase

31. 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
A missing air filter+improper rotation of the indoor blower+blower too small
An undercharge and low ambient conditions
Technician B

32. What are the symptoms of a TXV air conditioning system if it has lost its charge...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
The superheat will increase and the low-side pressure will decrease
Technician A is correct
The discharge pressure increases and the amperage increases

33. 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
The sensing bulb at a lower temperature than the valve body
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
It keeps a constant superheat in the evaporator

34. What problem can cause an increase of discharge pressure and an increase of suction pressure...
An uninsulated TXV sensing bulb
An overcharged system
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

35. A commercial customer calls on a 90
The discharge pressure increases and the amperage increases
High suction pressure and low superheat
The system has been overcharged+The system has air trapped in the condenser
Increases starting torque

36. 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
Increases starting torque
A start relay
Technician B

37. What is the purpose of the TXV...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
20 to 30
It keeps a constant superheat in the evaporator
The discharge pressure increases and the amperage increases

38. The best description of a relay would be...
A missing air filter+improper rotation of the indoor blower+blower too small
It is used to control refrigerant pressure in the compressor crankcase
Contains a solenoid coil and one or more sets of contacts
('Y' and 'C') and ('G' and 'C')

39. 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
An overcharged system
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Low superheat

40. What are the symptoms of a TXV air conditioning system if it has lost its charge...
Technician B
It is used to control refrigerant pressure in the compressor crankcase
The superheat will increase and the low-side pressure will decrease
A blown fuse

41. Which of the following can cause low superheat in a TXV system...
50-65
The low-side pressure will decrease and the evaporator coil will be partially frosted
3 psig
An uninsulated TXV sensing bulb

42. What component is most often the cause of a start capacitor failure...
Both technicians are correct
The discharge pressure increases and the amperage increases
An uninsulated TXV sensing bulb
A start relay

43. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
It keeps a constant superheat in the evaporator
Flooding the condenser - cycling condenser fans - and dampering condenser air
110-120

44. 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
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
The superheat will increase and the low-side pressure will decrease
Current in the compressor circuit
Technician B

45. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
A defective circuit breaker
An undercharge and low ambient conditions
Low voltage and a faulty start relay
The internal overload is opened

46. A commercial customer calls on a 90
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
'G' to 'C'
50-65

47. Which of the following will cause excessive discharge pressures on an air conditioning system...
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
An overcharged system
Evaporator and compressor

48. What is the purpose of a CPR valve...
The internal overload is opened
It is used to control refrigerant pressure in the compressor crankcase
A start capacitor and a solid-state relay
Both technicians are incorrect

49. The internal overload of an air conditioning compressor senses winding temperature and...
The low-side pressure will decrease and the evaporator coil will be partially frosted
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A start relay
Current in the compressor circuit

50. 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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NATE Air Conditioning Troubleshooting

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