Practice Test GeeksG3 - Gas Technician Level 3 Certification Practice Test
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G3 - Gas Technician Level 3 Pressure Regulation and Control Questions and Answers Flashcards

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Read the first 6 G3 - Gas Technician Level 3 Pressure Regulation and Control Questions and Answers flashcards as text

  1. What is the primary function of a gas pressure regulator?

    Answer: To reduce and maintain a constant downstream gas pressure regardless of upstream fluctuations

    A pressure regulator automatically reduces inlet pressure to a stable, lower outlet pressure suitable for appliances.

  2. In a two-stage gas distribution system, the first-stage regulator typically reduces line pressure from high pressure to approximately:

    Answer: 2 psi (medium pressure)

    First-stage regulators in two-stage systems reduce high-pressure distribution gas to an intermediate medium pressure of around 2 psi for delivery to homes or buildings.

  3. The outlet pressure for most residential gas appliances in the US served by natural gas is typically:

    Answer: 3.5 in. W.C. (approximately 0.87 kPa)

    Most residential natural gas appliances are designed to operate at 3.5 in. W.C. (about 0.125 psi) outlet pressure.

  4. A pressure regulator that allows outlet pressure to rise above its set point when gas flow stops is said to exhibit:

    Answer: Creep

    Creep (also called lock-up pressure rise) occurs when a regulator allows pressure to drift upward above set-point at zero flow due to a worn or improperly seated valve.

  5. What is 'droop' in the context of a gas pressure regulator?

    Answer: The decrease in outlet pressure that occurs as gas flow demand increases

    Droop is the reduction in regulated outlet pressure as flow through the regulator increases, a normal characteristic of spring-loaded regulators.

  6. A regulator vent must be positioned so that:

    Answer: It is protected from weather and insects while allowing free discharge of gas

    Regulator vents must be protected from rain, snow, and insect intrusion while remaining open to vent diaphragm side pressure and prevent over-pressure.