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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 system that uses a thermal electric expansion valve...






2. Insufficient airflow can be caused by...






3. 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






4. 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...






5. 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...






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






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






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






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






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






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






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






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






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






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






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






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






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






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






21. 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






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






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






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






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






26. 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






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






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






29. 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






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






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






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






33. 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






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






35. A commercial customer calls on a 90






36. 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






37. What is the purpose of the TXV...






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






39. 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






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






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






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






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






44. 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






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






46. A commercial customer calls on a 90






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






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






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






50. 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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