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






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






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






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






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






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






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






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






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






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






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






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






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






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






15. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...






16. 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...






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






18. 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






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






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






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






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






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






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






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






27. What is the purpose of the TXV...






28. 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






29. 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...






30. 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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31. 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...






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






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






34. 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






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






37. 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






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






39. 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






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






41. Insufficient airflow can be caused by...






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






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






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






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






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






47. A commercial customer calls on a 90






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






49. A technician receives an air conditioning service call stating that the system is operating but isn't cooling properly. When the technician arrives - she notices that the compressor has recently been changed and it is an are-22 system. She checks the






50. 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