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Railways NTPC (Technical Ability) Metal Forming, Casting and Cutting Question Bank Metal Cutting

  • question_answer
    Cubic boron nitride:

    A) Has a very high hardness which is comparable to that of diamon

    B) Has a hardness which is slightly more than due of HSS

    C) Is used for making cylinder blocks of aircraft engines                                   

    D) Is used for making optical glasses

    Correct Answer: D

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