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. 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






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






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






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






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






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






7. 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






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






9. 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






10. 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...






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






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






13. 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






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






15. 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...






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






17. 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...






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






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






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






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






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






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






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






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






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






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






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






29. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...






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






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






32. 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






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






34. 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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35. 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






36. 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






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






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






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






40. The temperature range of the suction line from an air conditioning system should be...






41. 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...






42. 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...






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






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






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






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






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






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






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