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






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






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






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






5. 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






6. 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






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






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






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






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






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






12. 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






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






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






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






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






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






19. What is the purpose of the TXV...






20. Air filters should be replaced...






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






22. 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...






23. 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...






24. 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...






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






26. 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






27. 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






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






29. 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






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






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






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






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






34. 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






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






36. 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






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






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






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






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






41. 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






42. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...






43. What is the purpose of an EPR valve...






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






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






46. 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






47. 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






48. 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






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






50. 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...