Test your basic knowledge |

NATE Air Conditioning Troubleshooting

Subjects : engineering, nate
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 system that is operating with a clear sight glass shows...






2. A restricted air filter in an air conditioning system can be identified by...






3. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...






4. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...






5. Why is it unsafe to operate an air conditioning system with a low charge...






6. A hard-start kit consists of...






7. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...






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






9. A system that uses a thermal electric expansion valve...






10. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...






11. Air filters should be replaced...






12. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...






13. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...






14. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...






15. The best description of a relay would be...






16. What is the purpose of an EPR valve...






17. 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






18. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...






19. What are two common symptoms of refrigerant leaks in an air conditioning system...






20. Which of the following can cause excessive subcooling...






21. What are the symptoms of a TXV air conditioning system if it has lost its charge...






22. A customer calls with an insufficient cooling complaint on a 90






23. 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






24. What problem or problems can cause low discharge and suction pressure...






25. 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...

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26. A compressor having tight bearings would cause the current value to...






27. 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






28. What three things can prevent an air conditioning system from absorbing heat at the proper rate...






29. The temperature range of the suction line from an air conditioning system should be...






30. What are the operating pressures of an oil pressure safety switch...






31. A liquid-charged TXV bulb will...






32. A system that uses a thermal electric expansion valve...






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






34. 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






35. 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






36. What is the purpose of a CPR valve...






37. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...






38. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...






39. 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...






40. What are two problems that can cause an air conditioning system to have an excessively high superheat...






41. Which of the following can cause low superheat in a TXV system...






42. 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






43. Which of the following can cause low superheat in a TXV system...






44. 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






45. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...






46. Superheat is found in an air conditioning system in the...






47. What component is most often the cause of a start capacitor failure...






48. 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






49. A restricted air filter in an air conditioning system can be identified by...






50. What three things can prevent an air conditioning system from absorbing heat at the proper rate...