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






2. Which of the following can cause low superheat in a TXV system...






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






4. 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






5. What are the symptoms of a TXV air conditioning system if it has lost its charge...






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






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






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






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






11. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...






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






14. What is the purpose of the TXV...






15. Air filters should be replaced...






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






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






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






19. 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






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






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






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






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






24. 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






25. 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






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






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






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






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






31. 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






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






33. 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...






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






35. 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






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






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






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






39. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...






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






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






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






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






44. 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






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






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






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






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






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






50. 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