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. In what state is the refrigerant in the compressor?






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






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






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






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






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






7. At what temperature will brazing melt?






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






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






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






11. What are normal conditions - as defined by the ARI.






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






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






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






15. 6' round duct has a ballpark cfm of what?






16. What do you use to check for leaks?






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






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






19. How will too much refrigerant effect superheat?






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






21. How do you calculate ballpark superheat?






22. Most duct insulation is made of what?






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






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






25. How do you calculate LRA?






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






27. At what temperature will brazing melt?






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






29. How is insulation around a duct rated?






30. 8' round duct has a ballpark cfm of what?






31. Superheat should never be below how many degrees






32. 6' round duct has a ballpark cfm of what?






33. How will too much refrigerant effect superheat?






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






35. The fan switch opens at what temperature?






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






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






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






39. What are the two types of blower drives?






40. How is flexible duct supported?






41. What are the two ways that fresh air enters a structure?






42. When do you install an auxillary drain pan?






43. The fan switch closes at what temperature?






44. How will too much refrigerant effect subcooling?






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






46. How do you calculate cfm?

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47. How many cfm per ton?






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






49. What is considered normal operating conditions?






50. Why are some ACR tubing lines insulated?