JCECE Engineering JCECE Engineering Solved Paper-2002

  • question_answer
    A monoatomic ideal gas is compressed to its \[1/8\] volume adiabatically at \[{{17}^{o}}C\]. Temperature after compression will be:

    A) \[{{34}^{o}}C\]                 

    B) \[{{17}^{o}}C\]

    C)  \[{{136}^{o}}C\]                              

    D)  \[{{887}^{o}}C\]

    Correct Answer: D

    Solution :

    Given\[{{V}_{1}}=V,\,\,{{V}_{2}}=\frac{1}{8}V\] \[{{T}_{1}}={{17}^{o}}C=290\,\,K,\,\,r=1.667\](for monoatomic gases)\[{{T}_{2}}=?\]                 \[\frac{{{T}_{2}}}{{{T}_{1}}}={{\left[ \frac{{{V}_{1}}}{{{V}_{2}}} \right]}^{r-1}}\] or            \[\frac{{{T}_{2}}}{290}={{\left( \frac{V}{1/8\,\,V} \right)}^{1.667-1}}\] or            \[\frac{{{T}_{2}}}{290}={{(8)}^{0.667}}\] \[\therefore \]  \[{{T}_{2}}=1160\,\,K=1160-273={{887}^{o}}C\]


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