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. Insufficient airflow can be caused by...






2. Insufficient airflow can be caused by...






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






4. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90






5. 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






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






7. 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






8. Air filters should be replaced...






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






10. 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






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






12. 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






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






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






15. 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






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






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






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






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






20. 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






21. 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...






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






23. 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






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






25. A commercial customer calls complaining that her rooftop air conditioning system is not operating. The technician arrives on the job and sets the thermostat to cooling - then notices that the indoor fan is not operating. The technician then sets the

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26. Air filters should be replaced...






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






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






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






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






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






32. 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






33. 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






34. 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






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






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






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






38. 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






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






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






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






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






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






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






45. 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






46. 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






47. Which of the following is a possible cause for a compressor to overheat...






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






49. A commercial customer calls on a 90






50. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.