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






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






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






4. What is the normal evaporator temperature?






5. 9' round duct has a ballpark cfm of what?






6. How will too much refrigerant effect superheat?






7. Most duct insulation is made of what?






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






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






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






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






12. How are round ducts connected to one another?






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






14. What is lined duct?






15. How do you calculate LRA?






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






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






18. What are the three crafts normally associated with an air-conditioned installation?






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






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






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






22. How do you achieve high-efficiency?






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






24. On what terminal do you check amperage?






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






26. What do you do after you braze a system?






27. Superheat should never be below how many degrees






28. What do you use to connect square and rectangular ductboard together?






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






30. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?






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






32. What is considered normal operating conditions?






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






34. How many BTU's per ton?






35. How long should you leave a system off once you kill power before restarting it?






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






37. The evaporator is designed to remove what two types of heat?






38. What are the three crafts normally associated with an air-conditioned installation?






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






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






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






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






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






44. 10' round duct has a ballpark cfm of what?






45. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?






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






47. How many amps can 8 g wire handle?






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






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






50. At what temperature will brazing melt?