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






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






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






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






5. 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






6. 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






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






8. 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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9. 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






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






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






12. Insufficient airflow can be caused by...






13. 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






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






15. 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






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






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






18. 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






19. 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






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






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






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






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






24. Insufficient airflow can be caused by...






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






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






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






28. 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






29. 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






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






31. A commercial customer calls on a 90






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






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






34. 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






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






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






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






38. 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






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






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






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






42. A customer calls to complain that his central air conditioning system is not cooling properly. The technician arrives on the job. He or she notices that the indoor blower has adequate airflow and the outdoor condenser fan is operating - but the compr






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






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






45. Which of the following is a possible cause for a compressor to overheat...






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






47. 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






48. What is the purpose of the TXV...






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






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