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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 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






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






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






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






5. 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






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






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






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






9. 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






10. 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






11. 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






12. 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...






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






14. 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






15. A commercial customer calls on a 90






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






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






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






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






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






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






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






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






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






25. 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






26. 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...






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






28. 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






29. A party-store owner tried to adjust the water valve on his water-cooled condensing unit - then he called for assistance from an HVAC/are service technician. It was found that when servicing the unit - the outlet water temperature was too low. Technic






30. 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






31. 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...






32. Insufficient airflow can be caused by...






33. 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...






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






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






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






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






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






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






41. 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






42. 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






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






44. A party-store owner tried to adjust the water valve on his water-cooled condensing unit - then he called for assistance from an HVAC/are service technician. It was found that when servicing the unit - the outlet water temperature was too low. Technic






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






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






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






48. 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






49. 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






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







Sorry!:) No result found.

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