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






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






3. Insufficient airflow can be caused by...






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






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






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






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






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






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






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






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






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






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






14. 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






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






16. 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






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






18. 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






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






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






21. 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...






22. 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






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






24. What is the common cause of a compressor burnout...






25. 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...






26. 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






27. 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






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






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






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






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






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






33. 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






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






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






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






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






38. 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






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






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






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






42. 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






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






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






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






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






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






49. Technician A says that to manually pump down an air conditioning system with a two-position service valve - the liquid line must be front-seated and the high- and low-side pressure will decrease to 0 psig when the pump-down is complete. Technician B






50. 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