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






2. 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...






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






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






5. A commercial customer calls on a 90






6. 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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7. 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






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






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






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






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






12. Insufficient airflow can be caused by...






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. 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






15. Which of the following will cause excessive discharge pressures on an air conditioning system...






16. 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






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






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






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






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






21. 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...






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






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






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






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






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






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






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






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






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






32. 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






33. What type of problems can be caused by an oversized air conditioning system...






34. 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...






35. 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






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






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






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






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






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






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






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






43. 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






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






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






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






47. 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






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






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






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







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