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






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






3. 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






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






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






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






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






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






9. 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






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






11. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...






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






13. A customer calls with an insufficient cooling complaint. Upon arrival to the service call it is found that the system is using are-22 with the high-side pressure at 290 psig and the low-side pressure at 85 psig. The ambient temperature is 85






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






15. 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






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






17. A technician receives an air conditioning service call stating that the system is operating but isn't cooling properly. When the technician arrives - she notices that the compressor has recently been changed and it is an are-22 system. She checks the






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






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






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






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






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






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






25. 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...






26. 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






27. 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






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






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






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






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






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






33. 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...






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






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






36. 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






37. What are three methods for controlling a system's high-side pressure during low ambient conditions...






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






39. 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...






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






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






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






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






45. 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






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






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






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