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 fan switch closes at what temperature?






2. How is insulation around a duct rated?






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






4. 10' round duct has a ballpark cfm of what?






5. How is ACR tubing sized?






6. What do you use to check for leaks?






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






8. 10 SEER is classified as what kind of efficiency?






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






10. How many cfm per ton?






11. How is nominal-sized tubing sized?






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






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






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






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






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






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






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






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






20. How is flexible duct supported?






21. How are round ducts connected to one another?






22. 7' round duct has a ballpark cfm of what?






23. 7' round duct has a ballpark cfm of what?






24. How do you calculate LRA?






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






26. The furnace size is calculated by what?






27. Why are some ACR tubing lines insulated?






28. A reciprocating compressor has what sort of moving parts?






29. How many amps can 12 g wire handle?






30. At what temperature will brazing melt?






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






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






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






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






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






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






37. The fan switch opens at what temperature?






38. 10' round duct has a ballpark cfm of what?






39. 9' round duct has a ballpark cfm of what?






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






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






42. How do you calculate cfm?

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






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






45. How will too much refrigerant effect superheat?






46. Superheat should never be below how many degrees






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






48. What is the range for normal superheat and subcooling?






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






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