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






2. 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...






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






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






5. 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

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






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






8. 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






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






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






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






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






13. 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...






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






15. 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






16. Insufficient airflow can be caused by...






17. 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

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






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






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






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






22. Air filters should be replaced...






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






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






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






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






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






28. 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






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






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






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






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






33. 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






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






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






36. 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






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






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






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






40. 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...






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






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






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






44. 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






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






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






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






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






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






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