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 . 23. (608) What is the maximum allowable working pressure for low-pressure heating boilers with a maximum temperature limitation of 250°F?
    160 psi.
  • 2 . 86. (048) Combustion is normally controlled
    either by manual or automatic control devices.
  • 3 . 80. (442) Which test is essentially the same as the performance verification test?
    Opposite season test.
  • 4 . What is the relationship among matter, energy, and heat?
    Matter is made of atoms, which consist of electrons kept in motion by heat, which is a form of energy.
  • 5 . 72. (037) On a call for heat, what relay closes to start the heating system in a primary control?
    Load relay.
  • 6 . 36. (018) The most commonly used gas pressure measuring devices are the
    bourdon and manometer devices.
  • 7 . 91. (447) What would the output pressure of the temperature controller be if the sensor were sensing 70° Fahrenheit?
    13 psi.
  • 8 . 46. (614) Which duct system terminal unit has a manually operated damper that is adjusted when the system is initially balanced and then left in that position to maintain constant airflow?
  • 9 . 76. (441) In critical buildings or locations, sensors for differential-pressure flow meters should be calibrated every
    three months.
  • 10 . 50. (615) The use of a return-air fan in a central station unit is optional but generally is essential for proper operation of
    larger systems.