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 used to measure static air pressure in ducts.






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






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






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






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






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






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






8. How do you calculate LRA?






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






10. What are the two types of package units?






11. The fan switch closes at what temperature?






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






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






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






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






16. How is nominal-sized tubing sized?






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






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






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






20. A reciprocating compressor has what sort of moving parts?






21. When do you install an auxillary drain pan?






22. How do you calculate LRA?






23. How will too much refrigerant effect superheat?






24. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)






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






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






27. How do you calculate cfm?

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28. The fan switch opens at what temperature?






29. How many cfm per ton?






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






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






32. How many amps can 14 g wire handle?






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






34. How does ACR copper pipe come?






35. 8' round duct has a ballpark cfm of what?






36. Most duct insulation is made of what?






37. Will a dirty condenser cause a rise or fall in pressure?






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






39. How many amps can 12 g wire handle?






40. What is lined duct?






41. When do you install an auxillary drain pan?






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






43. How will too much refrigerant effect subcooling?






44. Most duct insulation is made of what?






45. What distributes supply air to a room in a structure?






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






47. 10' round duct has a ballpark cfm of what?






48. How do you calculate cfm?

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






50. A reciprocating compressor has what sort of moving parts?