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






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






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






5. An air conditioning system that uses a fan center has an inoperable indoor blower. When the thermostat is set for cooling and dialed below room temperature - a test with the voltmeter shows that there is 24 volts across terminals 'are' and 'G' at the






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






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






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






9. 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






10. 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






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






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






13. Insufficient airflow can be caused by...






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






15. 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






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






17. 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






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






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






20. 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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21. A commercial customer calls on a 90






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






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






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






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






27. 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






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






29. 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






30. Air filters should be replaced...






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






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






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






34. 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






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






36. 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






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






38. 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...






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






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 operating with a clear sight glass shows...






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






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






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






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






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






47. 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...






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






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






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