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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 ' 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






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






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






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






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






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






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






8. 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






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






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






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






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






13. 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






14. 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






15. 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






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






17. Air filters should be replaced...






18. A system that is being serviced has been evacuated down to 500 microns. When the gauges are closed and the vacuum pump is turned off - the pressure starts to increase and stops at 1000 microns. Technician A says that the system has a leak and needs t






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






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






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






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






23. 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...






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






25. 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






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






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






28. 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






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






30. 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






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






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






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






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






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






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






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 low superheat in a TXV system...






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






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






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






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






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






45. What type of problems can be caused by an oversized air conditioning system...






46. 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






47. 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






48. 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






49. 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






50. 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...