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 are two common symptoms of refrigerant leaks in an air conditioning system...
An increase in suction pressure and an increase in discharge pressure
Both technicians are correct
Partially frosted evaporator and high superheat
The low-side pressure will decrease and the evaporator coil will be partially frosted

2. 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
An increase in suction pressure and an increase in discharge pressure
Rise more than normal
A start relay

3. A compressor having tight bearings would cause the current value to...
Technician B
Always have some liquid present in the bulb and diaphragm
Rise more than normal
Flooding the condenser - cycling condenser fans - and dampering condenser air

4. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Short cycling and insufficient dehumidification
Evaporator and compressor
A plugged filter drier

5. 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
A blown fuse
Technician B
A blown fuse
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

6. 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
It is used to control refrigerant pressure in the compressor crankcase
The system has been overcharged+The system has air trapped in the condenser
An increase of air leakage from ductwork

7. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
An undercharge and low ambient conditions
It would cause the low-side pressure to decrease
50-65
Technician B

8. 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
A defective circuit breaker
Clean the condenser coil
The external equalizer could be plugged
An undercharged system+insufficient airflow over the evaporator coil

9. A hard-start kit for an air conditioning system...
The oil pump pressure and the crankcase pressure
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Increases starting torque
The external equalizer could be plugged

10. Why is it unsafe to operate an air conditioning system with a low charge...
50-65
A sensing bulb improperly connected to the suction line
Run with high head and high suction pressure
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

11. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A start capacitor and a solid-state relay
High suction pressure and low superheat
Run with high head and high suction pressure

12. What problem can cause an increase of discharge pressure and an increase of suction pressure...
An overcharged system
It is used to control refrigerant pressure in the compressor crankcase
An increase of air leakage from ductwork
Technician B

13. 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

14. A system that uses a thermal electric expansion valve...
An overcharged system
A start relay
Technician A
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

15. 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...
Flooding the condenser - cycling condenser fans - and dampering condenser air
A blown fuse
An increase in low-side pressure
The low-side pressure will decrease and the evaporator coil will be partially frosted

16. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A low refrigerant charge
Dirty condenser - bent condenser fins - and air recirculating over the condenser
An uninsulated TXV sensing bulb

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
Whenever necessary
An open internal overload protector
Technician A
A vacuum test+oil traces around fittings+soap bubble solution

18. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
An increase in low-side pressure
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Increases starting torque
An increase in low-side pressure

19. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
A bad thermostat
A start capacitor and a solid-state relay
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
3 psig

20. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
Technician B
Technician B
Low discharge pressure - high suction pressure - and low amp draw
An undercharged system+insufficient airflow over the evaporator coil

21. 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
It would cause the low-side pressure to decrease
Both technicians are incorrect
Increases starting torque
A vacuum test+oil traces around fittings+soap bubble solution

22. Insufficient airflow can be caused by...
3 psig
The sight glass is full of liquid+the sight glass is full of gas
An increase of air leakage from ductwork
Evaporator and compressor

23. 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
50-65
An increase in low-side pressure
An undercharged system+insufficient airflow over the evaporator coil

24. A commercial customer calls on a 90
An overcharged system
'G' to 'C'
The system has been overcharged+The system has air trapped in the condenser
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

25. 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...
Technician B
High superheat and low discharge pressure
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician B

26. 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
High suction pressure and low superheat
The superheat will increase and the low-side pressure will decrease
An undercharged system+insufficient airflow over the evaporator coil

27. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
Run with high head and high suction pressure
110-120
It is used to control refrigerant pressure in the compressor crankcase
Technician A

28. What are the symptoms of a TXV air conditioning system if it has lost its charge...
An undercharge and low ambient conditions
The superheat will increase and the low-side pressure will decrease
Partially frosted evaporator and high superheat
Technician B

29. The internal overload of an air conditioning compressor senses winding temperature and...
Current in the compressor circuit
Technician B
Bad compressor valve
An uninsulated TXV sensing bulb

30. 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...
A blown fuse
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
50-65

31. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Contains a solenoid coil and one or more sets of contacts
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An open internal overload protector
Both technicians are incorrect

32. What are two problems that can cause an air conditioning system to have an excessively high superheat...
The superheat increases and the subcooling decreases
Technician B
Whenever necessary
An uninsulated suction line and a restricted metering device

33. 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
An open internal overload protector
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Both technicians are incorrect
Low voltage and a faulty start relay

34. What are three methods for controlling a system's high-side pressure during low ambient conditions...
The sensing bulb at a lower temperature than the valve body
A restricted metering device
Flooding the condenser - cycling condenser fans - and dampering condenser air
A defective circuit breaker

35. 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
The internal overload is opened
Increases starting torque
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

36. 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
The low-side pressure will decrease and the evaporator coil will be partially frosted
The discharge pressure increases and the amperage increases
Current in the compressor circuit
A defective circuit breaker

37. Which of the following could be the cause for a system's discharge and suction pressure being low...
A start relay
A missing air filter+improper rotation of the indoor blower+blower too small
An undercharged system+insufficient airflow over the evaporator coil
A restricted metering device

38. 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...
The superheat will increase and the low-side pressure will decrease
Condenser fans operating during a low ambient condition and a low suction pressure
Current in the compressor circuit
It keeps a constant superheat in the evaporator

39. 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
An increase in low-side pressure
A bad thermostat
The system has been overcharged+The system has air trapped in the condenser
Technician B

40. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Always have some liquid present in the bulb and diaphragm
Dirty condenser - bent condenser fins - and air recirculating over the condenser
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Both technicians are incorrect

41. 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

42. 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
Technician B
Rise more than normal
An increase of air leakage from ductwork
An overcharged system

43. 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
Low discharge pressure - high suction pressure - and low amp draw
An uninsulated suction line and a restricted metering device
The external equalizer could be plugged
An increase in low-side pressure

44. Which of the following will cause excessive discharge pressures on an air conditioning system...
The discharge pressure increases and the amperage increases
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician A is correct

45. 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
Technician B
An increase of air leakage from ductwork
A vacuum test+oil traces around fittings+soap bubble solution
Low superheat

46. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
An uninsulated TXV sensing bulb
High suction pressure and low superheat
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A low refrigerant charge

47. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
The superheat increases and the subcooling decreases
Current in the compressor circuit
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
('Y' and 'C') and ('G' and 'C')

48. What is the purpose of the TXV...
Technician B
Both technicians are incorrect
It keeps a constant superheat in the evaporator
High superheat and low discharge pressure

49. 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
An acid-core suction line drier
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Both technicians are incorrect
Low discharge pressure - high suction pressure - and low amp draw

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
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Lack of airflow
Technician A
Both technicians are correct

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

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