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






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






3. Air filters should be replaced...






4. 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






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






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






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






8. Technician A says that if you connect 208 volts to the primary side of a 240-volt/ 24-volt transformer - the transformer will burn out. Technician B says that if you connect 208 volts to the primary side of a 240-volt/24-volt transformer - the contro






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






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






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






12. 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






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






14. 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






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






16. 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






17. 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...






18. 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






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






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






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






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






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






25. 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






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






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






28. Air filters should be replaced...






29. What is the purpose of the TXV...






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






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






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






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






34. 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






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






36. 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






37. A restricted air filter in an air conditioning system can be identified by...






38. Insufficient airflow can be caused by...






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






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






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






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






43. 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






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






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






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






47. Technician A says that if you connect 208 volts to the primary side of a 240-volt/ 24-volt transformer - the transformer will burn out. Technician B says that if you connect 208 volts to the primary side of a 240-volt/24-volt transformer - the contro






48. 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






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






50. 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