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






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






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






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






5. 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






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






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






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






9. 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...






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






11. 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






12. 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






13. 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






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






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






16. Air filters should be replaced...






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






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






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






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






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






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






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






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






26. 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...






27. 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






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






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






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






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






32. A commercial customer calls on a 90






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






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






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






36. 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






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






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






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






41. Insufficient airflow can be caused by...






42. 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






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






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






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






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






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






48. 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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49. 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...






50. 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