Test your basic knowledge |

Residential Air Conditioning

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. The evaporator is designed to remove what two types of heat?






2. How is insulation around a duct rated?






3. How will too much refrigerant effect superheat?






4. Do you need a trap on a pull-through evaporator?






5. How do you calculate ballpark superheat?






6. What is the normal evaporator temperature?






7. What do you use to connect square and rectangular ductboard together?






8. What are the four materials used to make duct?






9. How is flexible duct supported?






10. Most duct insulation is made of what?






11. How do you calculate cfm?

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12. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)






13. How do you calculate LRA?






14. What gauge is thermostat wire?






15. How many amps can 10 g wire handle?






16. The load on the evaporater will effect which pressure?






17. How many amps can 8 g wire handle?






18. The fan switch opens at what temperature?






19. What can cause a decrease in suction pressure on an air-conditioning system?






20. How many BTU's per ton?






21. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?






22. How do you achieve high-efficiency?






23. What are the three ways a motor can fail electrically?






24. What standard weight copper tubing is most often used in the heating and air-conditioning industry?






25. If the rpm's are 750 - how many poles does the motor have?






26. What do you use to check for leaks?






27. What sort of pressure will a push-through evaporator have?






28. Do you need a vent on a pull-through evaporator?






29. At what temperature will brazing melt?






30. How do you calculate ballpark superheat?






31. What are the two functions of the air-conditioning system?






32. How are the condenser coils different on a high-efficiency unit?






33. What is the name of the fitting where the branch line leaves the duct?






34. When do you install an auxillary drain pan?






35. The fan switch closes at what temperature?






36. How long should you leave a system off once you kill power before restarting it?






37. What is the design boiling point for most evaporator coils in residential air conditioning?






38. How are high-efficiency condenser coils different from standard-efficiency condenser coils?






39. How is flexible duct supported?






40. At what temperature will soft solder melt?






41. What is used to measure static air pressure in ducts.






42. The crankcase heater on an air-conditioning compressor is used to what?






43. What are the two types of return air systems in residential installations?






44. 7' round duct has a ballpark cfm of what?






45. What do you use to connect square and rectangular ductboard together?






46. How do you calculate the area of a circle?






47. What is the difference between SEER and EER?






48. Where do you install a trap on a drain line?






49. Does a package unit come from the factory pre-charged?






50. Which is more efficient - a TXV or a fixed-orifice metering device?