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  1. When more volume of acetylene and less volume of oxygen is supplied, then a ________ flame is obtained.

    2. A.

     Neutral
    B.

     Oxidizing
    C.

     Carburising
    D.

     None of these

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    Answer : Option C

    Explanation :

    When more volume of acetylene and less volume of oxygen is supplied, then a Carburising flame is obtained.

    carburizing flame is one with little oxygen, which produces a sooty, lower-temperature flame. It is often used to anneal metal, making it more malleable and flexible during the welding process

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