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 are common methods that are used for leak-testing a system...






2. 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...






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






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






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






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






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






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






9. 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






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






11. Insufficient airflow can be caused by...






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






13. 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






14. Technician A says ' When charging a system using the superheat method - adding refrigerant to the system will increase the superheat.' Technician B says 'When charging a system using the superheat method - adding refrigerant will decrease the superhe






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






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






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






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






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






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






21. 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






22. 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






23. 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...






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






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






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






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






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






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






30. 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






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






32. 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






33. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...






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






35. A commercial customer calls on a 90






36. What is the purpose of the TXV...






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






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






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






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






41. Insufficient airflow can be caused by...






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






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






44. 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


45. 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






46. 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






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






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






49. 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






50. Technician A says ' When charging a system using the superheat method - adding refrigerant to the system will increase the superheat.' Technician B says 'When charging a system using the superheat method - adding refrigerant will decrease the superhe