Railways Technical Ability Vibration Analysis Question Bank Vibration Analysis

  • question_answer A composite plane wall is made up of two different materials of the same thickness and having thermal conductivities of \[{{k}_{1}}\] and \[{{k}_{2}}\] respectively. The equivalent thermal conductivity of the slab is:

    A) \[{{k}_{1}}+{{k}_{2}}\]                     

    B) \[{{k}_{1}}{{k}_{2}}\]

    C) \[\frac{{{k}_{1}}+{{k}_{2}}}{{{k}_{1}}{{k}_{2}}}\]             

    D) \[\frac{2{{k}_{1}}{{k}_{2}}}{{{k}_{1}}+{{k}_{2}}}\]

    Correct Answer: D


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