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Railways NTPC (Technical Ability) Materials Science Question Bank Materials Science

  • question_answer
    Consider the following quenching media:
    1. Oil                           
    2. Water
    3. Water + NaOH         
    4. Brine
    The correct sequence of these media in order of increasing hardness of steel undergoing heat treatment is:

    A) 1, 3, 2, 4                      

    B) 2, 1, 3, 4

    C) 1, 2, 3, 4                      

    D) 4, 3, 2, 1

    Correct Answer: A

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