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






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






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






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






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






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






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. A hard-start kit consists of...






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






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






11. Which of the following will cause excessive discharge pressures on an air conditioning system...






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






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






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






15. 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






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






17. A commercial customer calls on a 90






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






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






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






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






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






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






24. 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






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






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






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






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






29. 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






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






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






32. Which of the following will cause excessive discharge pressures on an air conditioning system...






33. 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...






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






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






36. What is the purpose of the TXV...






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






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. 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






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






41. 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






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






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






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






45. A customer calls and complains that her high-efficiency air conditioning system is operating - but is not cooling properly. Further investigation shows that the system is using a TXV type of metering device. A subcooling check shows that the system a






46. 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






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






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






49. 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






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