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. 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
Whenever necessary
Run with high head and high suction pressure
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician B

2. A compressor having tight bearings would cause the current value to...
A start capacitor and a solid-state relay
A blown fuse
20 to 30
Rise more than normal

3. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An overcharged system
A start capacitor and a solid-state relay
Flooding the condenser - cycling condenser fans - and dampering condenser air

4. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
The low-side pressure will decrease and the evaporator coil will be partially frosted
An increase of air leakage from ductwork
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

5. Which of the following is a possible cause for a compressor to overheat...
Current in the compressor circuit
The system has been overcharged+The system has air trapped in the condenser
A low refrigerant charge
The external equalizer could be plugged

6. Superheat is found in an air conditioning system in the...
('Y' and 'C') and ('G' and 'C')
The oil pump pressure and the crankcase pressure
A plugged filter drier
Evaporator and compressor

7. 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...
The superheat will increase and the low-side pressure will decrease
Technician B
High superheat and low discharge pressure
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

8. Insufficient airflow can be caused by...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
An increase of air leakage from ductwork
Both technicians are incorrect
An increase in suction pressure and an increase in discharge pressure

9. 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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

10. What are two common symptoms of refrigerant leaks in an air conditioning system...
Whenever necessary
Technician B
Partially frosted evaporator and high superheat
The system has been overcharged+The system has air trapped in the condenser

11. Which of the following can cause low superheat in a TXV system...
An uninsulated TXV sensing bulb
Technician B
Technician B
Partially frosted evaporator and high superheat

12. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
20 to 30
A plugged filter drier
Technician B
Rise more than normal

13. When using a vapor-charged TXV bulb - it is necessary to have...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Lack of airflow
The sensing bulb at a lower temperature than the valve body
Both technicians are incorrect

14. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
The superheat increases and the subcooling decreases
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Technician A
Condenser fans operating during a low ambient condition and a low suction pressure

15. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
('Y' and 'C') and ('G' and 'C')
High suction pressure and low superheat
A restricted metering device
An open internal overload protector

16. What three things can prevent an air conditioning system from releasing heat at the proper rate...
A start relay
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Technician B
A dirty condenser - recirculation of condenser air - and a defective condenser fan

17. Which of the following is a possible cause for a compressor to overheat...
The discharge pressure increases and the amperage increases
A low refrigerant charge
Lack of airflow
A start capacitor and a solid-state relay

18. Air filters should be replaced...
A missing air filter+improper rotation of the indoor blower+blower too small
Partially frosted evaporator and high superheat
Whenever necessary
Lack of airflow

19. 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
A defective circuit breaker
An uninsulated TXV sensing bulb
50-65

20. 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
Whenever necessary
High suction pressure and low superheat
An undercharged system+insufficient airflow over the evaporator coil

21. What is the purpose of an EPR valve...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A dirty condenser - recirculation of condenser air - and a defective condenser fan
110-120
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

22. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
Evaporator and compressor
It keeps a constant superheat in the evaporator
Increases starting torque
A plugged filter drier

23. 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...
Run with high head and high suction pressure
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
An acid-core suction line drier

24. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Current in the compressor circuit
The discharge pressure increases and the amperage increases
Low voltage and a faulty start relay

25. 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
Both technicians are correct
Current in the compressor circuit
A start relay

26. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
The low-side pressure will decrease and the evaporator coil will be partially frosted
An increase in suction pressure and an increase in discharge pressure
Bad compressor valve
The sight glass is full of liquid+the sight glass is full of gas

27. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
It is used to control refrigerant pressure in the compressor crankcase
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Technician B

28. What are the operating pressures of an oil pressure safety switch...
A low refrigerant charge
The oil pump pressure and the crankcase pressure
50-65
The system has been overcharged+The system has air trapped in the condenser

29. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
Technician B
The superheat increases and the subcooling decreases
An uninsulated TXV sensing bulb
An uninsulated suction line and a restricted metering device

30. A compressor having tight bearings would cause the current value to...
50-65
Partially frosted evaporator and high superheat
Rise more than normal
A low refrigerant charge

31. 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
Both technicians are incorrect
Evaporator and compressor
Technician B
An increase in low-side pressure

32. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
110-120
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
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

33. 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...

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

34. 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
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
3 psig

35. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
Technician B
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
The external equalizer could be plugged
Current in the compressor circuit

36. 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
Whenever necessary
The internal overload is opened
Clean the condenser coil
Low voltage and a faulty start relay

37. What problem or problems can cause low discharge and suction pressure...
An undercharged system+insufficient airflow over the evaporator coil
Contains a solenoid coil and one or more sets of contacts
An increase in suction pressure and an increase in discharge pressure
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

38. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
A restricted metering device
Current in the compressor circuit
An undercharge and low ambient conditions
Dirty condenser - bent condenser fins - and air recirculating over the condenser

39. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
Lack of airflow
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An undercharge and low ambient conditions
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

40. A hard-start kit for an air conditioning system...
Increases starting torque
Bad compressor valve
Broken rings+broken valves+seized bearings
Flooding the condenser - cycling condenser fans - and dampering condenser air

41. A liquid-charged TXV bulb will...
Always have some liquid present in the bulb and diaphragm
A start relay
Technician B
An increase of air leakage from ductwork

42. A commercial customer calls on a 90
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
The system has been overcharged+The system has air trapped in the condenser
50-65
The superheat increases and the subcooling decreases

43. What are two problems that can cause an air conditioning system to have an excessively high superheat...
Technician B
Low superheat
An uninsulated suction line and a restricted metering device
Whenever necessary

44. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
Contains a solenoid coil and one or more sets of contacts
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Both technicians are incorrect
Lack of airflow

45. The temperature range of the suction line from an air conditioning system should be...
High suction pressure and low superheat
Both technicians are incorrect
50-65
An undercharge and low ambient conditions

46. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
A missing air filter+improper rotation of the indoor blower+blower too small
The oil pump pressure and the crankcase pressure
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
The superheat increases and the subcooling decreases

47. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Flooding the condenser - cycling condenser fans - and dampering condenser air
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
20 to 30

48. 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 superheat will increase and the low-side pressure will decrease
An undercharge and low ambient conditions
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Technician B

49. 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
Both technicians are incorrect
Flooding the condenser - cycling condenser fans - and dampering condenser air
Increases starting torque

50. 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
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Technician B
Technician A
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

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