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






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






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






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






5. 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






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






7. 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






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






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






10. 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...






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






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






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






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






15. 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...






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






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






18. 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






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






20. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90






21. A commercial customer calls on a 90






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






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






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






25. 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






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






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






28. 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...






29. 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






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






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






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






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






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






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






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






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






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






40. Insufficient airflow can be caused by...






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






42. 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






43. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90






44. 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






45. When troubleshooting a split-system air conditioner - it is found that the compressor motor is humming but not starting. Technician A says that it could be an open internal overload protector. Technician B says that it could be a blown fuse. Which te






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






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






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






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






50. 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