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 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...






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






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






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. 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






6. 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






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






8. 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






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






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






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






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






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






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






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






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






17. 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






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






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






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






21. 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






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






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






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






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






26. Which of the following will cause excessive discharge pressures on an air conditioning system...






27. Insufficient airflow can be caused by...






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






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






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






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






32. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...






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






34. 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...






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






37. 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...






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






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






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






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






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






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






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






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






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






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






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






49. Which of the following could be the cause for a system's discharge and suction pressure being low...






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