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. 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






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






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






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






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






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






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






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






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






10. Air filters should be replaced...






11. 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






12. 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






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






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






15. 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






16. 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






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






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






19. 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






20. 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






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






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






23. 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






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






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






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






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






28. 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






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






30. 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...






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






32. 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






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






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






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






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






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






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






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






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






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






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






43. A liquid-charged TXV bulb will...






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






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






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






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






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






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






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