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






2. 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






3. 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






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






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






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






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






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






9. 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






10. 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...






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






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






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






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






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






16. Insufficient airflow can be caused by...






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






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






19. 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






20. 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






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






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






23. What is the purpose of the TXV...






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






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






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






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






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






29. 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






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






31. 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...






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






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






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






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






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






37. 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






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






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






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






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






42. 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...






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






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






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






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






47. 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






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






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






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







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