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






3. 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






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






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






6. Insufficient airflow can be caused by...






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






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






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






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






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






12. 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






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






14. What is the purpose of the TXV...






15. 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






16. 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






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






18. 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






19. 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






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






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






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






23. 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






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






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






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






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






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






29. 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






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






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






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






33. 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






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






35. 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






36. 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...






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






38. 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






39. A commercial customer calls on a 90






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






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






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






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






44. 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






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






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






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






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






49. 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






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