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 it called when liquid refrigerant gets into the compressor?






2. What do you use to check for leaks?






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






4. 6' round duct has a ballpark cfm of what?






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






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






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






8. When do you install an auxillary drain pan?






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






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






11. What is lined duct?






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






13. Where do you check the amps on a motor?






14. What are the components of a hard-start kit?






15. Can refrigerant line sets be altered in length?






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






17. Pressure in ductwork is measured In what?






18. How do you achieve high-efficiency?






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






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






21. How will too much refrigerant effect subcooling?






22. What sort of pressure will a push-through evaporator have?






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






24. How are round ducts supported?

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






26. 9' round duct has a ballpark cfm of what?






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






28. Why are some ACR tubing lines insulated?






29. Where do you apply flux when soldering?






30. Most duct insulation is made of what?






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






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






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






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






35. What are the two types of blower drives?






36. The crankcase heater on an air-conditioning compressor is used to what?






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






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






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






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






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






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






43. The furnace size is calculated by what?






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






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






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






47. How many amps can 10 g wire handle?






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






49. What is a package unit?






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







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