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.

The version of this CDC we have in the database is 1

« Return to AFSC List
  • 1 . 59. (431) Use the following information to answer the next question: Controller = Barber Colman. ; Vcal = 7.5 VDC (at midpoint). ; Spanc = 3 VDC (6 – 9 direct current voltage (VDC). ; Tsp = 70° Fahrenheit. ; TRc = 4° Fahrenheit. ; Action = direct. What is the output voltage (Vout) at 72°F?
    9 direct current voltage (VDC).
  • 2 . 77. (624) As air flows from the discharge or intake of a fan to the ends of the duct runs, the gauge pressure
    decreases to zero.
  • 3 . 83. (045) Which of the following areas of preventive maintenance procedures are you following when you lubricate and tighten all linkages?
    System devices.
  • 4 . 47. (023) The shape of the flame can be altered from short and bushy to long and narrow in a horizontal rotary burner by
    interchangeable cups and air nozzles.
  • 5 . What type of warm-air furnace is known as a high-boy furnace?
    Upflow.
  • 6 . 59. (224) What prevents boiler water carryover?
    Blowdown.
  • 7 . 71. (622) The output capacity of a heat pump is strongly dependent on the
    available source of heat.
  • 8 . A single-duct system become a low-pressure reheat system when
    heating coils are inserted into the duct system downstream of the cooling coils.
  • 9 . 98. (055) In gas burners what is known as the principal reason for inefficient combustion?
    Too much excess air.
  • 10 . 31. (416) When calibrating a dual-input pneumatic controller, you adjust sensors one and two to the set point value. Your next step is to adjust the
    output pressure to equal calibration pressure (Pcal).