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






2. 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






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






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 the operating pressures of an oil pressure safety switch...






6. 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






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






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






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






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






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






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






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






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






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






17. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...






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






19. 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






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






21. 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






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






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






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






25. 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






26. 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






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






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






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






30. What is the purpose of the TXV...






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






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






33. 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






34. 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






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






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






37. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...






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






39. 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






40. 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






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






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






43. Insufficient airflow can be caused by...






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






45. 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






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






47. 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






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






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