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






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






3. 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






4. 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...






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






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. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...






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






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






10. 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






11. 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...

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12. The internal overload of an air conditioning compressor senses winding temperature and...






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






14. A commercial customer calls on a 90






15. 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...






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






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






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






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






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






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






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






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






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






25. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...






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






27. 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






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






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






30. 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






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






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






33. A commercial customer calls on a 90






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






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






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






37. 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






38. 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






39. A system that is operating with a clear sight glass shows...






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






41. Insufficient airflow can be caused by...






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






43. 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






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






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






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






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






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






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






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