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. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Technician A is correct
The discharge pressure increases and the amperage increases
A blown fuse

2. 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

3. 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 start capacitor and a solid-state relay
Clean the condenser coil
Technician A is correct
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

4. 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

5. A 220-volt 30-amp motor circuit keeps tripping the breaker after the motor is started. The starting amperage is 60 amps. When measuring the amperage of the circuit - This is drawn for a brief moment. After startup - the amperage drops to 22 amps and
Current in the compressor circuit
A defective circuit breaker
An uninsulated TXV sensing bulb
Technician B

6. A customer calls and complains that her high-efficiency air conditioning system is operating - but is not cooling properly. Further investigation shows that the system is using a TXV type of metering device. A subcooling check shows that the system a
The external equalizer could be plugged
Both technicians are correct
A sensing bulb improperly connected to the suction line
Run with high head and high suction pressure

7. The temperature range of the suction line from an air conditioning system should be...
Whenever necessary
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
It would cause the low-side pressure to decrease
50-65

8. 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...
Bad compressor valve
A low refrigerant charge
Technician A
Low voltage and a faulty start relay

9. Why is it unsafe to operate an air conditioning system with a low charge...
Technician A
The sight glass is full of liquid+the sight glass is full of gas
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Current in the compressor circuit

10. Which of the following will cause excessive discharge pressures on an air conditioning 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
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Low voltage and a faulty start relay

11. A system that uses a thermal electric expansion valve...
High suction pressure and low superheat
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 superheat will increase and the low-side pressure will decrease

12. What are the symptoms of a TXV air conditioning system if it has lost its charge...
Increases starting torque
The superheat will increase and the low-side pressure will decrease
Low voltage and a faulty start relay
The superheat increases and the subcooling decreases

13. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
20 to 30
An open internal overload protector
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Technician B

14. Air filters should be replaced...
Whenever necessary
Technician B
Contains a solenoid coil and one or more sets of contacts
A plugged filter drier

15. A compressor having tight bearings would cause the current value to...
Rise more than normal
An increase of air leakage from ductwork
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An open internal overload protector

16. When using a vapor-charged TXV bulb - it is necessary to have...
The sensing bulb at a lower temperature than the valve body
An undercharge and low ambient conditions
Both technicians are incorrect
Rise more than normal

17. 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
The oil pump pressure and the crankcase pressure
An undercharged system+insufficient airflow over the evaporator coil
The sensing bulb at a lower temperature than the valve body
Technician A

18. What are two problems that can cause an air conditioning system to have an excessively high superheat...
A low refrigerant charge
An uninsulated suction line and a restricted metering device
Both technicians are correct
Short cycling and insufficient dehumidification

19. A compressor having tight bearings would cause the current value to...
Rise more than normal
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
A blown fuse
A low refrigerant charge

20. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
An increase in suction pressure and an increase in discharge pressure
An increase of air leakage from ductwork
Run with high head and high suction pressure
An acid-core suction line drier

21. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Low voltage and a faulty start relay
Technician B

22. What is the purpose of a CPR valve...
An increase of air leakage from ductwork
A start capacitor and a solid-state relay
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

23. The internal overload of an air conditioning compressor senses winding temperature and...
A bad thermostat
It keeps a constant superheat in the evaporator
Current in the compressor circuit
Low voltage and a faulty start relay

24. 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 superheat will increase and the low-side pressure will decrease
Technician B
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Low superheat

25. 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 plugged filter drier
Both technicians are incorrect
Evaporator and compressor
Technician A is correct

26. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Technician B
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
An acid-core suction line drier

27. 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...
Flooding the condenser - cycling condenser fans - and dampering condenser air
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Condenser fans operating during a low ambient condition and a low suction pressure
Technician A

28. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
An undercharged system+insufficient airflow over the evaporator coil
The system has been overcharged+The system has air trapped in the condenser
Partially frosted evaporator and high superheat
Run with high head and high suction pressure

29. A restricted air filter in an air conditioning system can be identified by...
Flooding the condenser - cycling condenser fans - and dampering condenser air
The internal overload is opened
An uninsulated suction line and a restricted metering device
Low superheat

30. 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
Technician A
Technician B
The sensing bulb at a lower temperature than the valve body

31. 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
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
Technician B
Both technicians are incorrect

32. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
A plugged filter drier
('Y' and 'C') and ('G' and 'C')
A start relay
The sensing bulb at a lower temperature than the valve body

33. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
An uninsulated TXV sensing bulb
Lack of airflow
An overcharged system
The sensing bulb at a lower temperature than the valve body

34. What are two problems that can cause an air conditioning system to have an excessively high superheat...
A sensing bulb improperly connected to the suction line
A restricted metering device
High superheat and low discharge pressure
An uninsulated suction line and a restricted metering device

35. What component is most often the cause of a start capacitor failure...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Technician B
A start relay
Lack of airflow

36. What type of problems can be caused by an oversized air conditioning system...
An undercharged system+insufficient airflow over the evaporator coil
Low superheat
Short cycling and insufficient dehumidification
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

37. Which of the following can cause excessive subcooling...
An overcharged system
An uninsulated TXV sensing bulb
Always have some liquid present in the bulb and diaphragm
Low superheat

38. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
'G' to 'C'
The external equalizer could be plugged
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A missing air filter+improper rotation of the indoor blower+blower too small

39. 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
Technician A is correct
It is used to control refrigerant pressure in the compressor crankcase
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
The low-side pressure will decrease and the evaporator coil will be partially frosted

40. What three things can prevent an air conditioning system from releasing heat at the proper rate...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Increases starting torque
Short cycling and insufficient dehumidification
Technician B

41. 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...
High superheat and low discharge pressure
'G' to 'C'
Technician B
A low refrigerant charge

42. 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
Technician B
Technician A
Technician B
Clean the condenser coil

43. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
It is used to control refrigerant pressure in the compressor crankcase
20 to 30
It keeps a constant superheat in the evaporator
An undercharge and low ambient conditions

44. Which of the following can cause excessive subcooling...
An overcharged system
An acid-core suction line drier
Technician B
Technician B

45. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
Flooding the condenser - cycling condenser fans - and dampering condenser air
An undercharge and low ambient conditions
Always have some liquid present in the bulb and diaphragm
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

46. 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...
Technician B
An undercharge and low ambient conditions
The internal overload is opened
A missing air filter+improper rotation of the indoor blower+blower too small

47. 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
An undercharge and low ambient conditions
Both technicians are incorrect
Technician B
Technician B

48. Which of the following will cause excessive discharge pressures on an air conditioning system...
The low-side pressure will decrease and the evaporator coil will be partially frosted
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

49. 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
3 psig
('Y' and 'C') and ('G' and 'C')
An open internal overload protector
Technician B

50. A hard-start kit consists of...
Whenever necessary
The external equalizer could be plugged
Technician B
A start capacitor and a solid-state relay

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