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






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






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






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






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






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






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






8. 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






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






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






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






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






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






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






15. Air filters should be replaced...






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






17. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...






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






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






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






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






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






23. Insufficient airflow can be caused by...






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






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






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






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






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






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






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






31. 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






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






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






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






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






36. 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...






37. 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...






38. 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






39. 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...






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






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






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






43. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...






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






45. Air filters should be replaced...






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






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






48. A technician arrives on the job and the customer complains that there is no cooling on his rooftop unit. Troubleshooting the system - the technician finds that the compressor is faulty. He notices that there is another faulty compressor laying next t






49. A technician arrives on the job and the customer complains that there is no cooling on his rooftop unit. Troubleshooting the system - the technician finds that the compressor is faulty. He notices that there is another faulty compressor laying next t






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







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