3E451N Practice Test

Listed below are sample questions for 3E451N from our database. Register now to start taking tests for this AFSC! We have 448 questions currently in the database for this category.

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  • 1 . 13. (603) What are the two possible positions of the differential deluge valve?
    Standby and fire
  • 2 . 67. (225) What prevents leakage past the hub of a resilient-liner plug valve?
    Diaphragm seal
  • 3 . 31. (010) Which system identifies duties and tasks for every position needed to accomplish the Air Force mission?
    Military personnel classification
  • 4 . 69. (225) What is the first step in removing a General Twin Seal plug valve operator?
    Close the main valve
  • 5 . 13. (204) What Air Force instruction details blocking and tagging of electrical lines?
    32–1064
  • 6 . 76. (022) What term is used to describe the process of storing hazardous waste prior to disposal?
    Hazardous waste accumulation
  • 7 . 49. (422) How many times are pipes in the water systems tested?
    Twice, after the fixtures are installed and after the appliances are connected.
  • 8 . 28. (606) The vertical space between the supply line and the flood level rim must be at least
    two times the diameter of the supply pipe
  • 9 . 40. (418) What device do you install in a building distribution system to correct a water hammer problem?
    Vertical air chamber
  • 10 . 39. (608) The first test on a double check valve assembly is to ensure the check valves hold tight against
    1 psi in the direction of flow