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






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






3. Insufficient airflow can be caused by...






4. 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






5. 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...






6. 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...






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






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






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






10. 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






11. 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...






12. 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






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






14. 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






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






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






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






18. 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






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






20. 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






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






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






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






24. Air filters should be replaced...






25. 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






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






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






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






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






30. 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






31. 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...






32. 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






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






34. 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






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






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






37. 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...






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






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






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






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






42. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...






43. 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






44. A split-system air conditioner that uses a piston-type metering device is to be charged with are-22. Technician A says that the outdoor dry-bulb temperature is needed to determine the proper superheat. Technician B says that the indoor wet-bulb tempe






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






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






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






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






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






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