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    How many zones are there in neutral flame?
    Question

    How many zones are there in neutral flame?

    A.

    5

    B.

    3

    C.

    4

    D.

    2

    Correct option is D


    In neutral flame, Oxygen and acetylene are mixed in equal proportion in the blowpipe. The neutral flame has a 1:1 ratio of oxygen and acetylene by volume. Structurally it consists of two zones namely the inner cone and the outer envelope. It is used to weld most of the common metals, i.e.  mild steel, cast iron, stainless steel, copper and aluminium

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