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






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






3. 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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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...






5. 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






6. 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






7. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...






8. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...






9. What are common methods that are used for leak-testing a system...






10. A system that is operating with a clear sight glass shows...






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






12. 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






13. 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...






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






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






16. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...






17. Insufficient airflow can be caused by...






18. 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...






19. 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






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






21. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...






22. 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






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






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






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






26. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...






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






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






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






30. What type of problems can be caused by an oversized air conditioning system...






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






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






33. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...






34. 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






35. 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






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






37. What are three methods for controlling a system's high-side pressure during low ambient conditions...






38. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...






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






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






41. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...






42. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...






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






44. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...






45. 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






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






47. A hard-start kit for an air conditioning system...






48. 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






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






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