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






2. How many BTU's per ton?






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






4. At what temperature will soft solder melt?






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






6. The furnace size is calculated by what?






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






8. Where do you apply flux when soldering?






9. How will too much refrigerant effect subcooling?






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






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






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






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






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






15. How many amps can 10 g wire handle?






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






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






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






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






20. How are round ducts connected to one another?






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






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






23. How do you calculate cfm?

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24. Why are some ACR tubing lines insulated?






25. On what terminal do you check amperage?






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






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






28. Pressure in ductwork is measured In what?






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






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






31. How do you calculate LRA?






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






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






34. At what temperature does refrigerant condense in a high-efficiency unit?






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






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






37. Can refrigerant line sets be altered in length?






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






39. What do you use to check for leaks?






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






41. How many cfm per ton?






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






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






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






45. What tool is used to expand the diameter of soft copper tubing






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






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

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






49. If the rpm's are 1050 - how many poles does the motor have?






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