Which statement correctly describes the ignition potential of gas concentrations relative to LEL and UEL?

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Study for the Bioenvironmental Engineering Apprentice Block 2 Test. Use multiple-choice questions and detailed explanations to prepare effectively. Enhance your understanding with flashcards and improve your performance by practicing online. Gear up for success!

Multiple Choice

Which statement correctly describes the ignition potential of gas concentrations relative to LEL and UEL?

Explanation:
Gas ignition depends on the mixture being in the flammable range, defined by LEL and UEL. When the fuel concentration is between these limits, the air–fuel mix can ignite if there’s a source of ignition present. If the concentration is below the lower limit, the mix is too lean to ignite; if it’s above the upper limit, the mix is too rich to sustain combustion. Ignition also requires an adequate ignition source and proper mixing with air. So, mixtures within the LEL–UEL range can ignite with the right ignition source.

Gas ignition depends on the mixture being in the flammable range, defined by LEL and UEL. When the fuel concentration is between these limits, the air–fuel mix can ignite if there’s a source of ignition present. If the concentration is below the lower limit, the mix is too lean to ignite; if it’s above the upper limit, the mix is too rich to sustain combustion. Ignition also requires an adequate ignition source and proper mixing with air. So, mixtures within the LEL–UEL range can ignite with the right ignition source.

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