Allied & ICAR Exam Bank • ALLIED_1099 NAT • 2 Marks

Section 2: Farm Machinery

Farm Machinery

Subtopic: Disc Harrow Concavity

Question Statement:

A spherical disc blade of a disc harrow has a diameter of 500 mm and a radius of curvature of 600 mm. The depth of concavity of the disc in mm is:

Answer Key:

54.4

Step-by-Step Solution & Explanation

Concavity depth $c = R - \sqrt{R^2 - (D/2)^2}$. Here $R = 600\text{ mm}$ and $D/2 = 250\text{ mm}$. $c = 600 - \sqrt{600^2 - 250^2} = 600 - \sqrt{360000 - 62500} = 600 - \sqrt{297500} = 600 - 545.435 = 54.56\text{ mm}$.
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