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  1. Cores are used to

    2. A.

     Form internal cavities in the casting
    B.

     Improve mould surface
    C.

     Form a part of a green sand mould
    D.

     All of these

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    Answer : Option D

    Explanation :

    Cores are used to Form internal cavities in the casting and Improve mould surfaceand used to Form a part of a green sand mould
    core is a device used in casting and moulding processes to produce internal cavities and reentrant angles .
    The core is normally a disposable item that is destroyed to get it out of the piece

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