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






2. 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






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






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






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






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






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






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






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






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






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






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






13. 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






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






15. 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






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






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






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






19. 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...






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






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






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






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






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






25. 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...






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






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






28. A commercial customer calls on a 90






29. 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






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






31. Insufficient airflow can be caused by...






32. Air filters should be replaced...






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






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






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






36. 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






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






38. 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...






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






40. 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






41. 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






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






43. 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






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






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






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






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






50. 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







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