Test your basic knowledge |

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






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






3. 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...






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






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






6. Air filters should be replaced...






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






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






9. Insufficient airflow can be caused by...






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






11. 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






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






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






14. 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






15. Air filters should be replaced...






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






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






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






19. 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






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






21. A commercial customer calls on a 90






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






24. 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






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






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






27. 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






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






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






30. 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






31. 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






32. 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






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






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






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






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






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






38. 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






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






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






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






42. A liquid-charged TXV bulb will...






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






44. 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






45. 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






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






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






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






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






50. 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...