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. What is the typical pressure differance across a TXV?






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






3. What is the typical pressure differance across a TXV?






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






5. What is considered normal operating conditions?






6. Where do you apply flux when soldering?






7. How do you achieve high-efficiency?






8. At what temperature will soft solder melt?






9. How do you calculate cfm?

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10. 8' round duct has a ballpark cfm of what?






11. What is it called when liquid refrigerant gets into the compressor?






12. What are the two types of package units?






13. If the rpm's are 1050 - how many poles does the motor have?






14. Why are some ACR tubing lines insulated?






15. How is flexible duct supported?






16. 10' round duct has a ballpark cfm of what?






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






18. What do you do after you braze a system?






19. How do you calculate LRA?






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






21. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?






22. What are the three pressures created by moving air in ductwork?






23. When must a copper joint never be soldered or brazed?






24. What percentage silver do you use to braze two dissimilar metals such as steel and copper?






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






26. How many amps can 12 g wire handle?






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






28. How is flexible duct supported?






29. What type of air conditioning system must be charged using the superheat method?






30. 10' round duct has a ballpark cfm of what?






31. The compressor is cooled by liquid refrigerant. (True of False)






32. When must a copper joint never be soldered or brazed?






33. How much does a drain line need to drop per foot of length?

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34. Which type of wire can handle a higher ampacity?






35. When do you install an auxillary drain pan?






36. What are the three major power-consuming devices on an air-conditioning system?






37. How is ACR tubing sized?






38. On what terminal do you check amperage?






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






40. What are the two basic duct connection configurations for package units supply and return air ducts?






41. 6' round duct has a ballpark cfm of what?






42. What gauge is thermostat wire?






43. Which type of wire can handle a higher ampacity?






44. When do you install a trap on a drain line?






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






46. What tool is used to expand the diameter of soft copper tubing






47. The fan switch closes at what temperature?






48. How many amps can 10 g wire handle?






49. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?






50. What are the three pressures created by moving air in ductwork?