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






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






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






4. 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






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






6. 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






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






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






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






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






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






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...






13. 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






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






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






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






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 is the purpose of an EPR valve...






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






20. What is the purpose of the TXV...






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






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






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






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






25. Which of the following can cause excessive subcooling...






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






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






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






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






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






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






32. Air filters should be replaced...






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






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 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






36. 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






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






38. 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






39. 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...






40. 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






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






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






43. 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






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






45. 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...






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






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






48. 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






49. 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






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