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 many amps can 10 g wire handle?






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






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






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






6. What are the two types of blower drives?






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






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






9. The fan switch opens at what temperature?






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






11. What is the difference between SEER and EER?






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






13. How will too much refrigerant effect subcooling?






14. How do you calculate cfm?

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






16. If the rpm's are 3450 - how many poles does the motor have?






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






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






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






20. How is ACR tubing sized?






21. What is lined duct?






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






23. 9' round duct has a ballpark cfm of what?






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






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






26. The furnace size is calculated by what?






27. How is nominal-sized tubing sized?






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






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






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






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






32. Can refrigerant line sets be altered in length?






33. How is insulation around a duct rated?






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






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






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






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






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






39. What is the normal evaporator temperature?






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






41. How is flexible duct supported?






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






43. Superheat should never be below how many degrees






44. Do you need a vent on a pull-through evaporator?






45. 7' round duct has a ballpark cfm of what?






46. How many BTU's per ton?






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






48. When do you install an auxillary drain pan?






49. What is the difference between SEER and EER?






50. What are the two functions of the air-conditioning system?