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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. 13 SEER is classified as what kind of efficiency?






2. What kind of metering device do high-efficiency units usually use?






3. How is the high pressure switch wired with the low pressure switch?






4. 6' round duct has a ballpark cfm of what?






5. The A/C size is calculated by what?






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






7. At what temperature will brazing melt?






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






9. How does ACR copper pipe come?






10. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?






11. 10' round duct has a ballpark cfm of what?






12. 6' round duct has a ballpark cfm of what?






13. What kind of copper tubing is used for plumbing and heating applications?






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






15. Most duct insulation is made of what?






16. How do you calculate LRA?






17. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?






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






19. What is considered normal operating conditions?






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






21. How do you calculate cfm?

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






23. At what temperature does refrigerant condense in a high-efficiency unit?






24. What sort of pressure will a pull-through evaporator have?






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






26. If pressure rises - what happens to the superheat?






27. What is a package unit?






28. What percentage silver do you need to use for an are-410 system?






29. If the suction pressure rises - what happens to the head pressure?






30. In what length rolls is soft copper tubing normally available?






31. How do you calculate LRA?






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






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






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






35. Do you need a trap on a push-through evaporator?






36. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?






37. What do you use to check for leaks?






38. How is insulation around a duct rated?






39. How is ACR tubing sized?






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






41. What kind of copper tubing is used for plumbing and heating applications?






42. What is the difference between SEER and EER?






43. 9' round duct has a ballpark cfm of what?






44. Why are some ACR tubing lines insulated?






45. How many BTU's per ton?






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






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






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






49. How do you calculate EER?






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







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