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






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






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






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






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






7. A 220-volt 30-amp motor circuit keeps tripping the breaker after the motor is started. The starting amperage is 60 amps. When measuring the amperage of the circuit - This is drawn for a brief moment. After startup - the amperage drops to 22 amps and






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






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






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






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






12. 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






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






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






15. 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






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






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






18. 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






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






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






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






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






23. Insufficient airflow can be caused by...






24. A 220-volt 30-amp motor circuit keeps tripping the breaker after the motor is started. The starting amperage is 60 amps. When measuring the amperage of the circuit - This is drawn for a brief moment. After startup - the amperage drops to 22 amps and






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






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






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






29. 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






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






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






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






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






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






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






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






37. 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






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






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






40. 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...






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






42. 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






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






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






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






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. A commercial customer calls on a 90






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






49. 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






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