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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 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






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






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






4. Insufficient airflow can be caused by...






5. 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






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






7. 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...






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






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. 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






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






12. 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






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






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






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






16. A commercial customer calls on a 90






17. Why is it unsafe to operate an air conditioning system with a low charge...






18. A system that is being serviced has been evacuated down to 500 microns. When the gauges are closed and the vacuum pump is turned off - the pressure starts to increase and stops at 1000 microns. Technician A says that the system has a leak and needs t






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






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






21. 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






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






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






24. What is the purpose of the TXV...






25. 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






26. 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...






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






28. 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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29. 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






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






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






32. 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






33. 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






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






35. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...






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






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






38. 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






39. 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






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






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






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






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






45. 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






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






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






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






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






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







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