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






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






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






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






5. 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






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






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






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






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






10. What is the purpose of the TXV...






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






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






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






14. 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






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






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






17. 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






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






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






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






22. Technician A says that to manually pump down an air conditioning system with a two-position service valve - the liquid line must be front-seated and the high- and low-side pressure will decrease to 0 psig when the pump-down is complete. Technician B






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






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






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






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






27. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...






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






30. 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...






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






32. A commercial customer calls on a 90






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






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






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






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






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






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






39. 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






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






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






42. 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






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






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






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






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






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






48. 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






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