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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. 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






2. What is the purpose of the TXV...






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






4. 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






5. 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






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






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






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






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






10. 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






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






12. 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






13. 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






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






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






16. 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






17. 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






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






19. 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






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






21. 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






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






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






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






25. 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






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






27. 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...






28. 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...






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






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






31. 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






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






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






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






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






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






37. A commercial customer calls on a 90






38. When testing an indoor blower control circuit and the cooling circuit on a fan center - what terminals should read 24 volts if the air conditioning system is in operation...

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






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






41. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...






42. A commercial customer calls on a 90






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






44. 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...






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






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






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






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






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






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