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






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






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






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






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






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






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






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






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






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






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






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






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






14. A commercial customer calls on a 90






15. What problem can cause an increase of discharge pressure and an increase of suction pressure...






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






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






18. 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






19. A liquid-charged TXV bulb will...






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






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






22. Insufficient airflow can be caused by...






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






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






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






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






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






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






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






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






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






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






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






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






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






36. A commercial customer calls on a 90






37. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...






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






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






40. 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...






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






42. A customer who owns a split air conditioning system complains that his system has been running but his house doesn't seem to be cooling properly. When the service technician arrives on the job - he or she finds that the indoor blower is operating and






43. 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...






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






45. 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...






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






47. 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






48. 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...






49. 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






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