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






2. 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...






3. A commercial customer calls on a 90






4. Insufficient airflow can be caused by...






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






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






7. 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






8. 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...






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






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






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






12. 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






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






14. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90






15. Which of the following can cause excessive subcooling...






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






17. 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






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






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






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






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






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






24. A customer calls to complain that his central air conditioning system is not cooling properly. The technician arrives on the job. He or she notices that the indoor blower has adequate airflow and the outdoor condenser fan is operating - but the compr






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






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






27. 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






28. Air filters should be replaced...






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






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






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






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






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






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






35. 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...






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






37. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...






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






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






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






42. 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






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






44. 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






45. 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






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






47. 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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48. 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...






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






50. 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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