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.
Both technicians are incorrect
The discharge pressure increases and the amperage increases
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
An acid-core suction line drier

2. What three things can prevent an air conditioning system from releasing heat at the proper rate...
The superheat increases and the subcooling decreases
A dirty condenser - recirculation of condenser air - and a defective condenser fan
The sight glass is full of liquid+the sight glass is full of gas
The discharge pressure increases and the amperage increases

3. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Low discharge pressure - high suction pressure - and low amp draw
High suction pressure and low superheat
Low discharge pressure - high suction pressure - and low amp draw
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

4. 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...
A sensing bulb improperly connected to the suction line
Low superheat
An acid-core suction line drier
The internal overload is opened

5. 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
A missing air filter+improper rotation of the indoor blower+blower too small
A sensing bulb improperly connected to the suction line
Low superheat

6. Which of the following can cause low superheat in a TXV system...
A bad thermostat
Condenser fans operating during a low ambient condition and a low suction pressure
The system has been overcharged+The system has air trapped in the condenser
An uninsulated TXV sensing bulb

7. What is the purpose of a CPR valve...
The sight glass is full of liquid+the sight glass is full of gas
The discharge pressure increases and the amperage increases
It is used to control refrigerant pressure in the compressor crankcase
Partially frosted evaporator and high superheat

8. What are the operating pressures of an oil pressure safety switch...
Both technicians are incorrect
The oil pump pressure and the crankcase pressure
High superheat and low discharge pressure
A blown fuse

9. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
Technician B
Short cycling and insufficient dehumidification
The superheat increases and the subcooling decreases
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

10. Which of the following could be the cause for a system's discharge and suction pressure being low...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Both technicians are incorrect
A start capacitor and a solid-state relay
A restricted metering device

11. 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 start relay
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Both technicians are incorrect
It would cause the low-side pressure to decrease

12. A hard-start kit for an air conditioning system...
Increases starting torque
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Technician B
The sight glass is full of liquid+the sight glass is full of gas

13. A customer calls with an insufficient cooling complaint on a 90
A low refrigerant charge
'G' to 'C'
Technician B
Rise more than normal

14. Which of the following is a possible cause for a compressor to overheat...
Always have some liquid present in the bulb and diaphragm
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
A low refrigerant charge
An increase in suction pressure and an increase in discharge pressure

15. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
Bad compressor valve
High suction pressure and low superheat
An increase in low-side pressure
An overcharged system

16. What is the common cause of a compressor burnout...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Broken rings+broken valves+seized bearings
An increase in low-side pressure
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

17. A hard-start kit consists of...
Both technicians are correct
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A start capacitor and a solid-state relay
Contains a solenoid coil and one or more sets of contacts

18. 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...
A low refrigerant charge
The oil pump pressure and the crankcase pressure
Both technicians are incorrect
Condenser fans operating during a low ambient condition and a low suction pressure

19. When using a vapor-charged TXV bulb - it is necessary to have...
Low voltage and a faulty start relay
An overcharged system
The oil pump pressure and the crankcase pressure
The sensing bulb at a lower temperature than the valve body

20. A compressor having tight bearings would cause the current value to...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Bad compressor valve
Rise more than normal
Increases starting torque

21. A hard-start kit consists of...
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
Flooding the condenser - cycling condenser fans - and dampering condenser air
An open internal overload protector

22. A commercial customer calls on a 90
High superheat and low discharge pressure
The system has been overcharged+The system has air trapped in the condenser
Partially frosted evaporator and high superheat
A low refrigerant charge

23. 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
Partially frosted evaporator and high superheat
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician A is correct
A restricted metering device

24. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Flooding the condenser - cycling condenser fans - and dampering condenser air
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
20 to 30
('Y' and 'C') and ('G' and 'C')

25. 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
Whenever necessary
Technician B
An increase in low-side pressure
Dirty condenser - bent condenser fins - and air recirculating over the condenser

26. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
High superheat and low discharge pressure
20 to 30
An increase in suction pressure and an increase in discharge pressure
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

27. Which of the following is a possible cause for a compressor to overheat...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
3 psig
Low voltage and a faulty start relay
A low refrigerant charge

28. Which of the following could be the cause for a system's discharge and suction pressure being low...
A sensing bulb improperly connected to the suction line
High suction pressure and low superheat
A missing air filter+improper rotation of the indoor blower+blower too small
A restricted metering device

29. Which of the following can cause excessive subcooling...
An overcharged system
A start relay
An uninsulated suction line and a restricted metering device
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

30. 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

31. What type of problems can be caused by an oversized air conditioning system...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
An uninsulated suction line and a restricted metering device
Short cycling and insufficient dehumidification
Technician A is correct

32. 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

33. A restricted air filter in an air conditioning system can be identified by...
'G' to 'C'
Low superheat
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Technician B

34. A system that is operating with a clear sight glass shows...
Technician A
Clean the condenser coil
A plugged filter drier
The sight glass is full of liquid+the sight glass is full of gas

35. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
It is used to control refrigerant pressure in the compressor crankcase
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
The discharge pressure increases and the amperage increases
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

36. The best description of a relay would be...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A vacuum test+oil traces around fittings+soap bubble solution
Contains a solenoid coil and one or more sets of contacts
A start relay

37. 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
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Bad compressor valve
The oil pump pressure and the crankcase pressure
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

38. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
50-65
Rise more than normal
Partially frosted evaporator and high superheat

39. 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
Broken rings+broken valves+seized bearings
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician A

40. 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
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Both technicians are incorrect
Partially frosted evaporator and high superheat
A vacuum test+oil traces around fittings+soap bubble solution

41. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Lack of airflow
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
The discharge pressure increases and the amperage increases

42. 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...
Technician B
The low-side pressure will decrease and the evaporator coil will be partially frosted
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
A blown fuse

43. Why is it unsafe to operate an air conditioning system with a low charge...
Contains a solenoid coil and one or more sets of contacts
An open internal overload protector
A start capacitor and a solid-state relay
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

44. Superheat is found in an air conditioning system in the...
Evaporator and compressor
The superheat will increase and the low-side pressure will decrease
Bad compressor valve
A restricted metering device

45. What are the symptoms of a TXV air conditioning system if it has lost its charge...
An increase in suction pressure and an increase in discharge pressure
A bad thermostat
The superheat will increase and the low-side pressure will decrease
A blown fuse

46. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
3 psig
Technician B
Broken rings+broken valves+seized bearings
The superheat increases and the subcooling decreases

47. What are the symptoms of an air conditioning system that has a low charge...
The superheat increases and the subcooling decreases
It would cause the low-side pressure to decrease
The low-side pressure will decrease and the evaporator coil will be partially frosted
It is used to control refrigerant pressure in the compressor crankcase

48. 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
It is used to control refrigerant pressure in the compressor crankcase
The discharge pressure increases and the amperage increases
An open internal overload protector
A defective circuit breaker

49. 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
Both technicians are incorrect
Condenser fans operating during a low ambient condition and a low suction pressure
High suction pressure and low superheat
Technician B

50. 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 bad thermostat
Technician B
The internal overload is opened

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