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Railways NTPC (Technical Ability) Metal Forming, Casting and Cutting Question Bank Metal Forming

  • question_answer
    A circular annular plate having outer and inner diameters of 1.4 m and 0.6 respectively is immersed in water with its plane making an angle of \[60{}^\circ \] with the horizontal. The centre of the circular annular plate is 1.85 m below the free surface. The hydrostatic thrust on one side of the plate is:

    A) 1975 N             

    B) 19.75 N

    C) 11.4 N              

    D) 22.8 N

    Correct Answer: D

    Solution :

    Hydrostatic thrust on inclined plane \[=\rho g\,\,A\bar{x}\] \[={{10}^{3}}\times 9.81\times \frac{\pi }{4}[{{(1.4)}^{2}}-{{(0.6)}^{2}}]\times 1.85\] =22.8 Kn


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