3E151O Practice Test

Listed below are sample questions for 3E151O from our database. Register now to start taking tests for this AFSC! We have 394 questions currently in the database for this category.

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  • 1 . A fan drive is an assembly made up of
    a motor sheave, fan sheave, and connecting belts.
  • 2 . 54. (222) A smoke detection system sensor is
    a cadmium sulfide photocell.
  • 3 . 97. (243) What do you use to remove soot, dirt, and scale from flues and fireboxes of boilers?
    Wire brushes.
  • 4 . 85. (445) If desired to maintain a constant temperature in the air leaving a coil, what type of coil control is used?
    Discharge control.
  • 5 . 36. (217) What keeps a safety valve closed against the force developed by the steam pressure acting under the valve disc?
    A compressed spring.
  • 6 . 12. (007) In low pressure systems, gas is usually distributed at pressures from
    3 to 8 ounces psi.
  • 7 . 23. (212) The internal feedpipe is installed in the water space near, but not touching, the
    bottom of the drum.
  • 8 . 36. (612) Which steam trap reacts to a difference in the temperature between the steam and condensate?
  • 9 . What is the most serious defect to look for when you inspect a heat exchanger?
  • 10 . 57. (431) Which electronic controllers may combine temperature and humidity measurements to measure heat content?
    Enthalpy controllers.