Railways Technical Ability Internal Combustion Engine (ICE) Question Bank Internal Combustion Engine (ICE)

  • question_answer 2000 cc. of air takes \[1{\scriptstyle{}^{1}/{}_{2}}\] minutes to pass through a standard Specimen of sand (5.08 cm high and 5.08 cm in dia.). The manometer indicates pressure as \[5\,\,\text{g/c}{{\text{m}}^{\text{2}}}\text{.}\] In this case the permeability number is:

    A) 30                                

    B) 42

    C) 51                                

    D) 67

    Correct Answer: D

    Solution :

    Permeability number, \[P=\frac{Vh}{pAt}\] \[V=2000\,\,c.c.,\] \[t=1.5\,\,\min ,\] \[h=5.08\,\,cm,\] \[d=5.08\,\,cm,\]  \[p=5\,\,\text{g/c}{{\text{m}}^{\text{2}}}\] \[P=\frac{2000\times 5.08}{5\times \frac{\pi }{4}\,{{(5.08)}^{2}}\times 1.5}=66.83=67\]

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