3E451O Practice Test

Listed below are sample questions for 3E451O from our database. Register now to start taking tests for this AFSC! We have 400 questions currently in the database for this category.

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  • 1 . 63. (624) Which technical order should you consult before operating the sewer sucker trailer?
  • 2 . 66. (028) What type diagram is a simple drawing showing the relationship of system major parts?
  • 3 . 66. (220) If the 40AF–2A, fuel discharge valve, fails to open, what should you check first?
    Water in the filter/separator.
  • 4 . 47. (212) When can people enter a fuel tank without protective equipment?
    0 percent LEL, the tank has been washed out and dried, the tank is known never to have contained leaded fuel, and the Bioenvironmental Engineer has approved their entry
  • 5 . 91. (431) What valve is used as the flush valve in a Type IV system?
  • 6 . 71. (029) Ammeters are used to check for
    current draw (flow)
  • 7 . Which properties make JP–4 the most dangerous of all the fuels?
    Low vapor pressure and high volatility.
  • 8 . 90. (037) When you clean a motor with compressed air, what is the maximum air pressure to use in pounds per square inch (psi)?
    25 psi
  • 9 . 14. (203) The wind girder is installed on floating roof tanks to
    prevent the collapse of the tank shell
  • 10 . 24. (609) What is the maximum reverse osmosis pump pressure that should never be exceeded when operating the reverse osmosis water purification unit?
    960 psi (seawater), 500 psi (brackish water)