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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. 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






2. 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






3. What problem can cause an increase of discharge pressure and an increase of suction pressure...






4. 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






5. Insufficient airflow can be caused by...






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






7. What are two problems that can cause an air conditioning system to have an excessively high superheat...






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






9. 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






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






11. Air filters should be replaced...






12. 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






13. 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






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






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






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






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






18. 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






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






20. 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






21. 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






22. 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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23. 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...






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






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






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






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






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






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






31. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...






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






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






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






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






36. 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...






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






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






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






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






41. 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...






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






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






44. 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...






45. 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






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






48. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...






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






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