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






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






3. 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...






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






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






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






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






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






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






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






11. The temperature range of the suction line from an air conditioning system should be...






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






13. A commercial customer calls on a 90






14. 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...






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






16. 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






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






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






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






20. 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






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






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






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






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






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






26. 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...






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






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






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






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






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






32. 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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33. 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






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






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. 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






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






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






39. Insufficient airflow can be caused by...






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






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






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






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






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






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






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






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






48. 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






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






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