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. Before adjusting a gas service regulator set-point, the technician must first:

    Answer: Confirm the downstream piping is rated for the new pressure and obtain proper authorization

    Changing regulator set-point can affect all downstream equipment; piping rating, appliance ratings, and AHJ or utility authorization must be verified first.

  2. Which tool is used to measure gas pressure in inches of water column (in. W.C.) at appliance manifolds?

    Answer: Inclined or digital manometer

    A manometer (inclined tube or digital) measures low gas pressures in inches of water column, which is the standard unit for appliance manifold pressure.

  3. What is the purpose of a gas pressure relief valve (PRV) on a gas system?

    Answer: To open and vent gas when system pressure exceeds a predetermined safe limit

    A gas PRV opens automatically to vent excess pressure to the atmosphere when system pressure rises above its set-point, protecting piping and equipment.

  4. When testing a regulator for lock-up (no-flow pressure), the technician should close the downstream valve and observe the pressure gauge. An acceptable result is:

    Answer: Pressure stabilizes at or slightly above the set outlet pressure within the manufacturer's allowed lock-up band

    At no-flow (lock-up) conditions, a properly functioning regulator allows only a small, specified rise above its set-point, not full inlet pressure.

  5. A gas technician notices that a regulator vent screen is blocked with insect nesting material. The immediate corrective action is:

    Answer: Clear the blockage and inspect the vent screen; replace the regulator if the diaphragm may be compromised

    A blocked vent screen can trap pressure on the diaphragm side, causing the regulator to under-regulate or fail, and must be cleared immediately.

  6. In the US, gas service regulators at residential meters are typically the responsibility of:

    Answer: The gas utility company, which installs and maintains them as part of service delivery

    In the US, the gas utility owns and maintains the service regulator at the meter; the technician's responsibility begins at the outlet of the meter.