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






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






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






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






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






7. 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






8. Insufficient airflow can be caused by...






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






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






12. 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...






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






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






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






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






17. What is the purpose of the TXV...






18. 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






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






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






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






22. 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...






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






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






25. 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...






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






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






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






29. Air filters should be replaced...






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






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






32. 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






33. 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






34. 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






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






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






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






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






39. 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






40. 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






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






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






43. 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...






44. 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






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






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






47. Insufficient airflow can be caused by...






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






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






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