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






2. 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






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






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






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






6. 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






7. 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






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






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






10. 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






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






12. A commercial customer calls on a 90






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






14. 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






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






16. 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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17. 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...






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






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






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






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






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






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






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






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






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






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






28. 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






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






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






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






32. 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






33. What problem or problems can cause low discharge and suction pressure...






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






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






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






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






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






39. 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






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






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






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






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






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






45. 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...






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






47. Insufficient airflow can be caused by...






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






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






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






Can you answer 50 questions in 15 minutes?



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