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 . 58. (031) Temperature at the rectifying photocell must remain under
    165°F.
  • 2 . 99. (244) What is the most common type of glycol used in hot-water heating systems?
    Ethylene.
  • 3 . 57. (224) The proper way to purge the furnace of a boiler is to purge 5 minutes at
    1/4 the maximum airflow.
  • 4 . 49. (427) What meter should you use to check a two-position control without power?
    Ohmmeter.
  • 5 . When you perform a test to ensure that the safety limit control is operating properly, which circuit do you disconnect?
    Blower.
  • 6 . 69. (036) What steps can be taken to provide a stronger pilot flame on a flame rod rectification system?
    Increase gas pressure or enlarge the orifice.
  • 7 . 83. (627) Under what step of preparing test reports does listing systems in groups, supplies, returns, and exhausts come?
    Filling out an air system recap sheet.
  • 8 . 11. (405) Saturated steam is steam
    at the temperature of boiling water.
  • 9 . 10. (204) What type of gas space heaters can be either gravity or mechanical air-circulation type and vented or unvented type?
    Room.
  • 10 . 58. (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 should the output voltage (Vout) be if the sensor is sensing 68°F?
    6 direct current voltage (VDC).