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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. 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






2. 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






3. 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






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






5. Air filters should be replaced...






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






7. 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...






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






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






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






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






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






13. 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






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






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






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






17. 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...






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






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






20. Technician A says that if you connect 208 volts to the primary side of a 240-volt/ 24-volt transformer - the transformer will burn out. Technician B says that if you connect 208 volts to the primary side of a 240-volt/24-volt transformer - the contro






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






24. 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






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






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






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






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






29. 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






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






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






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






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






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






35. 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






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






37. 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






38. 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






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






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






41. 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






42. Air filters should be replaced...






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






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






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






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






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






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






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






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