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






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






3. 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






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






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






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






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






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






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






10. 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






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






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






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






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






15. 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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16. 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






17. A commercial customer calls on a 90






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






19. 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...






20. 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...






21. A compressor motor starts and operates for a short period of time and cycles on the external overload protector. What are two possible problems that could cause this...






22. 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






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






25. 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






26. 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






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






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






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






30. 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






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






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






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






35. 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






36. 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






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






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






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






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






41. 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






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. A liquid-charged TXV bulb will...






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






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






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






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






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






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






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