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 is the purpose of a CPR valve...






2. 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


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






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






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






6. 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

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


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






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 commercial customer calls on a 90






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






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






12. Insufficient airflow can be caused by...






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






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






15. 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






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






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






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






19. 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






20. 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






21. 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






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. 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

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


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






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






26. 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






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






28. 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






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






30. 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






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






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






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






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






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






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






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






38. A customer calls and complains that her high-efficiency air conditioning system is operating - but is not cooling properly. Further investigation shows that the system is using a TXV type of metering device. A subcooling check shows that the system a






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






40. 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






41. 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...






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






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






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






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






46. 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...






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






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






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






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