Test your basic knowledge |

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. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
110-120
It would cause the low-side pressure to decrease
An open internal overload protector
The superheat will increase and the low-side pressure will decrease

2. 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 missing air filter+improper rotation of the indoor blower+blower too small
A vacuum test+oil traces around fittings+soap bubble solution
Technician B
3 psig

3. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
An overcharged system
High suction pressure and low superheat
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A plugged filter drier

4. Why is it unsafe to operate an air conditioning system with a low charge...
3 psig
Clean the condenser coil
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Dirty condenser - bent condenser fins - and air recirculating over the condenser

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...
An acid-core suction line drier
Low voltage and a faulty start relay
A blown fuse
High superheat and low discharge pressure

6. What are the symptoms of an air conditioning system that has a low charge...
Technician A
A restricted metering device
Partially frosted evaporator and high superheat
The low-side pressure will decrease and the evaporator coil will be partially frosted

7. What component is most often the cause of a start capacitor failure...
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
A start relay
An acid-core suction line drier
Both technicians are incorrect

8. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
Run with high head and high suction pressure
Low voltage and a faulty start relay
Broken rings+broken valves+seized bearings
Condenser fans operating during a low ambient condition and a low suction pressure

9. Technician A says that to manually pump down an air conditioning system with a two-position service valve - the liquid line must be front-seated and the high- and low-side pressure will decrease to 0 psig when the pump-down is complete. Technician B
A sensing bulb improperly connected to the suction line
Low voltage and a faulty start relay
Technician A is correct
It keeps a constant superheat in the evaporator

10. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
20 to 30
Whenever necessary
Short cycling and insufficient dehumidification
Low discharge pressure - high suction pressure - and low amp draw

11. What is the purpose of a CPR valve...
A bad thermostat
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
It is used to control refrigerant pressure in the compressor crankcase
The sensing bulb at a lower temperature than the valve body

12. A hard-start kit for an air conditioning system...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Increases starting torque
('Y' and 'C') and ('G' and 'C')
('Y' and 'C') and ('G' and 'C')

13. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
An undercharge and low ambient conditions
An undercharged system+insufficient airflow over the evaporator coil
Technician A

14. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
High superheat and low discharge pressure
Lack of airflow
It is used to control refrigerant pressure in the compressor crankcase
Technician A is correct

15. What component is most often the cause of a start capacitor failure...
Broken rings+broken valves+seized bearings
The system has been overcharged+The system has air trapped in the condenser
A start relay
It would cause the low-side pressure to decrease

16. When using a vapor-charged TXV bulb - it is necessary to have...
Both technicians are incorrect
The sensing bulb at a lower temperature than the valve body
Low superheat
Both technicians are incorrect

17. 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 open internal overload protector
Low discharge pressure - high suction pressure - and low amp draw
Low superheat
A bad thermostat

18. Superheat is found in an air conditioning system in the...
A missing air filter+improper rotation of the indoor blower+blower too small
Evaporator and compressor
Technician A
Bad compressor valve

19. The temperature range of the suction line from an air conditioning system should be...
110-120
Flooding the condenser - cycling condenser fans - and dampering condenser air
Run with high head and high suction pressure
50-65

20. 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 increases and the subcooling decreases
50-65
It is used to control refrigerant pressure in the compressor crankcase

21. A compressor having tight bearings would cause the current value to...
Rise more than normal
An open internal overload protector
The external equalizer could be plugged
The superheat increases and the subcooling decreases

22. What is the purpose of the TXV...
Technician A
It keeps a constant superheat in the evaporator
A low refrigerant charge
A plugged filter drier

23. 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
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Low voltage and a faulty start relay
Technician B
It is used to control refrigerant pressure in the compressor crankcase

24. What problem can cause an increase of discharge pressure and an increase of suction pressure...
An undercharged system+insufficient airflow over the evaporator coil
An overcharged system
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

25. What are common methods that are used for leak-testing a system...
Low superheat
A low refrigerant charge
A missing air filter+improper rotation of the indoor blower+blower too small
A vacuum test+oil traces around fittings+soap bubble solution

26. Insufficient airflow can be caused by...
An uninsulated suction line and a restricted metering device
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Technician B
An increase of air leakage from ductwork

27. A system that is operating with a clear sight glass shows...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
The sight glass is full of liquid+the sight glass is full of gas
An uninsulated suction line and a restricted metering device
An overcharged system

28. 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
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Technician B
Technician A is correct
The sensing bulb at a lower temperature than the valve body

29. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
A low refrigerant charge
Low discharge pressure - high suction pressure - and low amp draw
Short cycling and insufficient dehumidification
A dirty condenser - recirculation of condenser air - and a defective condenser fan

30. 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
'G' to 'C'
Bad compressor valve
Technician A is correct

31. 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
It would cause the low-side pressure to decrease
Technician B
An undercharged system+insufficient airflow over the evaporator coil
50-65

32. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
It would cause the low-side pressure to decrease
Flooding the condenser - cycling condenser fans - and dampering condenser air
The superheat increases and the subcooling decreases
A defective circuit breaker

33. 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...
('Y' and 'C') and ('G' and 'C')
The sensing bulb at a lower temperature than the valve body
It is used to control refrigerant pressure in the compressor crankcase
Low voltage and a faulty start relay

34. 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
Bad compressor valve
The external equalizer could be plugged
Lack of airflow

35. 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
A low refrigerant charge
Lack of airflow

36. 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
The internal overload is opened
Both technicians are correct
Increases starting torque
An open internal overload protector

37. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A restricted metering device
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Increases starting torque

38. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Clean the condenser coil
Lack of airflow
Whenever necessary
The superheat increases and the subcooling decreases

39. Which of the following is a possible cause for a compressor to overheat...
A low refrigerant charge
An overcharged system
Condenser fans operating during a low ambient condition and a low suction pressure
An increase in low-side pressure

40. 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
Both technicians are correct
Rise more than normal
Bad compressor valve
A vacuum test+oil traces around fittings+soap bubble solution

41. The best description of a relay would be...
The sight glass is full of liquid+the sight glass is full of gas
A defective circuit breaker
A low refrigerant charge
Contains a solenoid coil and one or more sets of contacts

42. Air filters should be replaced...
Technician B
Whenever necessary
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An increase in low-side pressure

43. What problem or problems can cause low discharge and suction pressure...
Both technicians are incorrect
High suction pressure and low superheat
An undercharged system+insufficient airflow over the evaporator coil
Increases starting torque

44. 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
Whenever necessary
Both technicians are incorrect
An increase in suction pressure and an increase in discharge pressure
It would cause the low-side pressure to decrease

45. What are three methods for controlling a system's high-side pressure during low ambient conditions...
3 psig
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
20 to 30
Flooding the condenser - cycling condenser fans - and dampering condenser air

46. 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
Both technicians are incorrect
An uninsulated suction line and a restricted metering device
The discharge pressure increases and the amperage increases
Clean the condenser coil

47. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
An overcharged system
A bad thermostat
Both technicians are correct
High suction pressure and low superheat

48. A hard-start kit for an air conditioning system...
The discharge pressure increases and the amperage increases
Increases starting torque
A blown fuse
Current in the compressor circuit

49. What are two common symptoms of refrigerant leaks in an air conditioning system...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
A vacuum test+oil traces around fittings+soap bubble solution
Partially frosted evaporator and high superheat
An overcharged system

50. What are the operating pressures of an oil pressure safety switch...
50-65
Rise more than normal
The oil pump pressure and the crankcase pressure
Technician B

Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?

Major Subjects
Tests & Exams AP CLEP DSST GRE SAT GMAT	Certifications CISSP go to https://www.isc2.org/ PMP ITIL RHCE MCTS More...	IT Skills Android Programming Data Modeling Objective C Programming Basic Python Programming Adobe Illustrator More...	Business Skills Advertising Techniques Business Accounting Basics Business Strategy Human Resource Management Marketing Basics More...
Soft Skills Body Language People Skills Public Speaking Persuasion Job Hunting And Resumes More...	Vocabulary GRE Vocab SAT Vocab TOEFL Essential Vocab Basic English Words For All Global Words You Should Know Business English More...	Languages AP German Vocab AP Latin Vocab SAT Subject Test: French Italian Survival Norwegian Survival More...	Engineering Audio Engineering Computer Science Engineering Aerospace Engineering Chemical Engineering Structural Engineering More...
Health Sciences Basic Nursing Skills Health Science Language Fundamentals Veterinary Technology Medical Language Cardiology Clinical Surgery More...	English Grammar Fundamentals Literary And Rhetorical Vocab Elements Of Style Vocab Introduction To English Major Complete Advanced Sentences Literature Homonyms More...	Math Algebra Formulas Basic Arithmetic: Measurements Metric Conversions Geometric Properties Important Math Facts Number Sense Vocab Business Math More...	Other Major Subjects Science Economics History Law Performing-arts Cooking Logic & Reasoning Trivia

Test your basic knowledge |

NATE Air Conditioning Troubleshooting

Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?

Let me suggest you:

Browse all subjects

Browse all tests

Most popular tests

Major Subjects

Tests & Exams

Certifications

IT Skills

Business Skills

Soft Skills

Vocabulary

Languages

Engineering

Health Sciences

English

Math

Other Major Subjects

Browse all subjects

Browse all tests

Most popular tests