Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer The relations between shear stress \[\left( \tau  \right)\] and velocity gradient for ideal fluids, Newtonian fluids and non-Newtonian fluids are given below. Select the correct combination:

    A) \[\tau =0\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}};\] \[\tau =\mu \,{{\left( \frac{du}{dv} \right)}^{3}}\]

    B) \[\tau =0\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}}\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}}\]

    C) \[\tau =\mu \,\left( \frac{du}{dy} \right)\,\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}};\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{3}}\]

    D) \[\tau =\mu \,\left( \frac{du}{dy} \right)\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}};\] \[\tau =0\]

    Correct Answer: B

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