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






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






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






5. 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






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






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






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






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






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






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






12. 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






13. 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






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






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






16. 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






17. Insufficient airflow can be caused by...






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






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






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






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






22. A commercial customer calls on a 90






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






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






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






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






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






28. What are two common symptoms of a rooftop air conditioning system that operates with a reverse-acting high-pressure control stuck in the closed position...






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






30. A compressor having tight bearings would cause the current value to...






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






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






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






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






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






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






37. 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






38. What are two common symptoms of a rooftop air conditioning system that operates with a reverse-acting high-pressure control stuck in the closed position...






39. Air filters should be replaced...






40. What is the purpose of the TXV...






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






42. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...






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






44. 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






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






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






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






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






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






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