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 causes the automatic expansion valve to close...






2. 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






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






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






5. Air filters should be replaced...






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






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






8. 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...






9. 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






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






11. 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






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






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






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






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






16. The technician observes that the compressor is not operating. The compressor windings read 5 ohms start to run - run to common is opened - and start to common is opened. The technician concludes that...






17. 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






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






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






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






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






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






23. 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






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






25. What is the purpose of the TXV...






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






27. 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






28. Insufficient airflow can be caused by...






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






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






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






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






33. 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...


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






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






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






37. 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






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






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






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






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






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






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






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






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






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






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






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






50. 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...