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






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






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






4. How many amps can 12 g wire handle?






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






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






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






8. How will too much refrigerant effect subcooling?






9. 13 SEER is classified as what kind of efficiency?






10. The compressor is cooled by liquid refrigerant. (True of False)






11. At what temperature will soft solder melt?






12. The fan switch opens at what temperature?






13. Superheat should never be below how many degrees






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






15. How are round ducts supported?

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16. How do you calculate cfm?

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






18. At what temperature will brazing melt?






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






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






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






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






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






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






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






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






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






28. Pressure in ductwork is measured In what?






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






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






31. How many amps can 12 g wire handle?






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

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33. What is the design boiling point for most evaporator coils in residential air conditioning?






34. How do you calculate ballpark superheat?






35. 10 SEER is classified as what kind of efficiency?






36. What do you use to check for leaks?






37. Why are some ACR tubing lines insulated?






38. The fan switch closes at what temperature?






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






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






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






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

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






44. Where do you apply flux when soldering?






45. Do you need a vent on a push-through evaporator?






46. How does ACR copper pipe come?






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






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






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






50. How are the high pressure switch and the low pressure switch wired with the compressor contactor?