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Railways NTPC (Technical Ability) Instrument Mechanical Question Bank Instrument Mechanical

  • question_answer
    Which of the following materials are used in Grinding wheel?
    1. Aluminum oxide        
    2. Cubic boron nitride
    3. Silicon carbide.
    Select the correct answer using the codes given below:
    Codes:

    A) 1, 2 and 3                     

    B) 1 and 2

    C) 2 and 3            

    D) 1 and 3.

    Correct Answer: A

    Solution :

    \[A{{l}_{2}}{{O}_{3}},\] BN and SiC are used in grinding wheels.


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