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 is the purpose of an EPR valve...






2. 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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3. A hard-start kit consists of...






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






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






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






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






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






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






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






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






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






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






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






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






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. 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






19. 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...






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






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






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






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






24. 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






25. 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






26. 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






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






28. 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...






29. A commercial customer calls on a 90






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






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






32. 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






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






34. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.






35. 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






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






37. 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






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






39. Air filters should be replaced...






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






41. 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






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






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






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






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






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






48. 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






49. 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






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