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






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






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






4. 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






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






6. 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






7. 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






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






9. 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






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






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






12. 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






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






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






15. 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






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






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






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






19. 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






20. A hard-start kit for an air conditioning system...






21. 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






22. 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...






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






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






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






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






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






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






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






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






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






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






33. 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






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






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






36. 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






37. A hard-start kit for an air conditioning system...






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






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






40. 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...






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






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






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






44. 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






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






46. 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






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






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






49. 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






50. 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