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. Insufficient airflow can be caused by...






2. 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






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






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






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






6. 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






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






8. 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






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






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






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






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






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






14. 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...






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






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






18. 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






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






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






21. 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






22. 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






23. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...






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






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






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






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






28. 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






29. 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...






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






31. 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...






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






33. A commercial customer calls on a 90






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






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






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






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






38. 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






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






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






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






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






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






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






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






46. 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






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






48. Insufficient airflow can be caused by...






49. 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






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