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. A liquid-charged TXV bulb will...






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






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






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






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






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






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






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






9. 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






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






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






12. 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






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






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






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






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






19. 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






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






21. 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






22. 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






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






24. 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






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






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






27. A commercial customer calls on a 90






28. 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






29. 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






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






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






32. 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






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






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






35. Air filters should be replaced...






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






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






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






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






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






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






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






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






44. Which of the following can cause excessive subcooling...






45. 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






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






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






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






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






50. 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...