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






2. 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...






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






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






5. Air filters should be replaced...






6. 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...






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






8. 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...






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






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






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






12. Insufficient airflow can be caused by...






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






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






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






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






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






18. 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






19. 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...






20. What problem can cause an increase of discharge pressure and an increase of suction pressure...






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






22. 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






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






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






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






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






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






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






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






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






31. 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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32. Insufficient airflow can be caused by...






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






34. What is the purpose of the TXV...






35. 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






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






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






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






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






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






41. 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






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






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






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






45. 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






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






47. 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






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






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






50. 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







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