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






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






3. Sections of duct board can be fastened together with what?






4. In what state is the refrigerant in the compressor?






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






6. What gauge is thermostat wire?






7. How do you achieve high-efficiency?






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






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






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






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






12. At what temperature will soft solder melt?






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






14. How do you calculate EER?






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






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






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






18. Superheat should never be below how many degrees






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






20. How much superheat do you need to prevent liquid refrigerant from entering the compressor?






21. What distributes supply air to a room in a structure?






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






23. Most duct insulation is made of what?






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






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






26. What is the difference between SEER and EER?






27. What gauge is thermostat wire?






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






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






30. The fan switch closes at what temperature?






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






32. How is flexible duct supported?






33. How do you calculate cfm?

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34. What kind of refrigeratnts must be added in liquid form?






35. On what terminal do you check amperage?






36. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?






37. Where do you check the amps on a motor?






38. What component changes refrigerant from a low pressure gas to a high pressure gas?






39. How will too much refrigerant effect superheat?






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






41. What are the two types of package units?






42. What are the components of a hard-start kit?






43. How many amps can 8 g wire handle?






44. Pressure in ductwork is measured In what?






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






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






47. What is a package unit?






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






49. If the rpm's are 1750 - how many poles does the motor have?






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







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