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






2. 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






3. 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...






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






5. 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...






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






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






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






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






10. The internal overload of an air conditioning compressor senses winding temperature and...






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






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






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






14. 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






15. 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






16. 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






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






18. 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






19. 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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






21. 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






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






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






24. 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






25. 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






26. 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






27. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.






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






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






30. 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...






31. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.






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






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






34. 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...






35. 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






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






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






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






39. 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






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






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






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 hard-start kit consists of...






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






45. 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...






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






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






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






49. A customer calls and says that her air conditioning system is not cooling properly. Upon arrival - a technician notices that the suction line and compressor have frost buildup. Technician A says that the problem is probably a low charge. Technician B






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