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. The internal overload of an air conditioning compressor senses winding temperature and...






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






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






4. Which of the following is a common cause of an excessively low superheat on a TXV system...






5. 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






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






7. 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






8. 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






9. What is the purpose of the TXV...






10. 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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11. A commercial customer calls on a 90






12. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...






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






14. Air filters should be replaced...






15. 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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16. 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






17. 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...






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






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






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






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






22. 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...






23. 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






24. What is the common cause of a compressor burnout...






25. When using a vapor-charged TXV bulb - it is necessary to have...






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






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






28. What is the common cause of a compressor burnout...






29. What are the symptoms of an air conditioning system that has a low charge...






30. 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






31. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...






32. 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...






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






34. An air conditioning system that uses a fan center has an inoperable indoor blower. When the thermostat is set for cooling and dialed below room temperature - a test with the voltmeter shows that there is 24 volts across terminals 'are' and 'G' at the






35. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...






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






37. 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






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






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






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






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






42. A commercial customer calls on a 90






43. 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...






44. 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...






45. Insufficient airflow can be caused by...






46. 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...






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






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






49. 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






50. What causes the automatic expansion valve to close...