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






3. How many amps can 10 g wire handle?






4. What is lined duct?






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






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






7. What are the two types of blower drives?






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






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






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






11. 9' round duct has a ballpark cfm of what?






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






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






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






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






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






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






18. What gauge is thermostat wire?






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






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






21. 13 SEER is classified as what kind of efficiency?






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






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






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






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






26. Which type of wire can handle a higher ampacity?






27. Where do you apply flux when soldering?






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






29. When must a copper joint never be soldered or brazed?






30. What is the normal evaporator temperature?






31. What is considered normal operating conditions?






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






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






34. The fan switch closes at what temperature?






35. 7' round duct has a ballpark cfm of what?






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






37. On what terminal do you check amperage?






38. How do you calculate ballpark superheat?






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






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






41. The fan switch opens at what temperature?






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






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






44. How is nominal-sized tubing sized?






45. Does a package unit come from the factory pre-charged?






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






47. How are round ducts connected to one another?






48. How do you calculate LRA?






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






50. 7' round duct has a ballpark cfm of what?