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CMC Medical CMC-Medical Ludhiana Solved Paper-2007

  • question_answer
    A sample of diesel has the same knocking characteristics as a 60 mL mixture of cetane and a-methyl naphthalene mixed in 2 :1 ratio. The cetane number of the diesel sample is

    A)  60                                         

    B)  40 

    C)  66.6                                      

    D)  33.3

    Correct Answer: C

    Solution :

                    Volume of cetane = 60 x (2/3) = 40 mL Volume of \[\alpha \text{-}\]methylnaphthalene \[=60\times \frac{1}{2}=20\text{ }mL\] \[\therefore \] cetane number of diesel sample \[=\frac{40}{60}\times 100=66.6\]


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