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






2. 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...






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






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






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






6. 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...






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






8. 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






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






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






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






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






13. 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






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






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






16. 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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17. 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...






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






19. 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






20. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...






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






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






23. 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






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






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






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. 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






28. What is the purpose of the TXV...






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






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






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






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






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






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






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






36. Air filters should be replaced...






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






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






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






41. 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






42. 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...






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






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






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






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






47. 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






48. 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






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






50. 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...