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






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






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






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






5. 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...






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






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






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






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






11. 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...






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






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






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






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






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






17. 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...






18. Insufficient airflow can be caused by...






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






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






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






22. 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






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






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






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






28. 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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29. What is the purpose of the TXV...






30. 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






31. 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






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






33. 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






34. 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...






35. 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






36. 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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37. A hard-start kit for an air conditioning system...






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






39. 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






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






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






42. 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






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






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






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






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






47. 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






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






49. 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






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