GATE 2026 AG – Question 29
A circular mild-steel wheat bin is 8 m high. Wheat bulk density is $800\,\mathrm{kg/m^3}$,grain–wall static friction coefficient 0.40,and bin hydraulic radius 1 m. Find its equivalent diameter in metres.
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Correct answer: (A) 4
Explanation
For a circular bin, the hydraulic radius is cross-sectional area divided by perimeter:$R_h=(\pi D^2/4)/(\pi D)=D/4$. Thus $D=4R_h=4$ m. The height, density and wall friction affect storage pressures, but not this geometric relation. **A**.