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






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






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






4. 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






5. Insufficient airflow can be caused by...






6. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...






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






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






9. 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






10. 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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11. 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






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






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






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






15. 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






16. Air filters should be replaced...






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






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






19. 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






20. 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






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






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






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






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






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






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






27. 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






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






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






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






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






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






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






34. 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






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






36. 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...






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






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






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






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






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






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






43. Insufficient airflow can be caused by...






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






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






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






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






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






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






50. What is the purpose of the TXV...