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. Where is insulation used on copper tubing used for air-conditioning?






2. What do you use to check for leaks?






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






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






5. What gauge is thermostat wire?






6. What is the difference between SEER and EER?






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






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






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






10. Can refrigerant line sets be altered in length?






11. What kind of copper tubing is used for refrigeration or air-conditioning applications?






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






13. What are the two types of blower drives?






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






15. Will a dirty condenser cause a rise or fall in pressure?






16. How do you calculate ballpark superheat?






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






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






19. How does ACR copper pipe come?






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






21. 9' round duct has a ballpark cfm of what?






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






23. How do you calculate EER?






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






25. Superheat should never be below how many degrees






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






27. The furnace size is calculated by what?






28. How many amps can 10 g wire handle?






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






30. How many amps can 12 g wire handle?






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






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






33. Most duct insulation is made of what?






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






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

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36. At what temperature will brazing melt?






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






38. The fan switch closes at what temperature?






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






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






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






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






43. At what temperature does refrigerant condense in a standard-efficiency unit?






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






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






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






47. The fan switch opens at what temperature?






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






49. How is insulation around a duct rated?






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