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






2. 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






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






4. 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...






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






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






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






8. 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






9. What is the purpose of the TXV...






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






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






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






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






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






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






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






17. 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






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






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






20. 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






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






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






23. 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...






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






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






26. 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






27. 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...






28. 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






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






30. 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






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






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






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






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






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






36. A system that is operating with a clear sight glass shows...






37. 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






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






39. Air filters should be replaced...






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






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






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






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






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






45. A hard-start kit consists of...






46. 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






47. 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






48. Air filters should be replaced...






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






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