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






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






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






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






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






6. 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






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






8. 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...






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






10. 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






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






12. 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...






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






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






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






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






17. 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






18. 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






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






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






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






22. 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...

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


23. 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...






24. Air filters should be replaced...






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






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






27. When troubleshooting a split-system air conditioner - it is found that the compressor motor is humming but not starting. Technician A says that it could be an open internal overload protector. Technician B says that it could be a blown fuse. Which te






28. 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






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






30. 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






31. A commercial customer calls on a 90






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






33. 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






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






35. Which of the following is a common cause of an excessively low superheat on a TXV system...






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






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






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






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






40. 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...






41. 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






42. 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...






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






44. 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...






45. 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






46. A customer calls with an insufficient cooling complaint on a 90






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






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






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






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