Railways Technical Ability Vibration Analysis Question Bank Vibration Analysis

  • question_answer Match List-I (Surfaces with Orientations) with List-II (Equivalent Emissivity) and select the correct answer using the codes given below the lists:
    List I (Surfaces with orientations) List-II (Equivalent Emissivity)
    A. Infinite parallel planes 1. \[{{\in }_{1}}\]
    B. Body 1 completely enclosed by body 2 but body 1 is very small 2. \[\frac{1}{\frac{1}{{{\in }_{1}}}+\frac{1}{{{\in }_{2}}}-1}\]
    C. Radiation exchange between two small gray bodies        3. \[\frac{1}{\frac{1}{{{\in }_{1}}}+\left( \frac{{{A}_{1}}}{{{A}_{2}}} \right)\left( \frac{1}{{{\in }_{2}}}-1 \right)}\]
    D. Two concentric cylinders with large lengths 4. \[{{\in }_{1}}.{{\in }_{2}}\]
    Codes:

    A) A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2

    B) A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3

    C) A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3

    D) A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2

    Correct Answer: C


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