Farm Machinery and Power Engineering- ICAR JRF/SRF 2024

Evaluating the Assertion and Reason concerning Potato other root crop:

The correct answer is Option 1: Both (A) and (R) are correct and (R) is the correct explanation of (A)..

• Connecting Rod Design via Rankine's Formula:
• Theory: The Rankine-Gordon formula is an empirical relation widely used for designing struts and columns of intermediate slenderness ratio ($L/k$), bridging the gap between Euler's buckling theory (valid only for very slender columns) and pure compressive crushing failure.
• Engine Application: The engine connecting rod acts as a pin-ended strut in the plane of rotation and a fixed-ended strut in the perpendicular plane, carrying intense alternating compressive gas pressure forces. Its shank cross-section (usually I-beam) is dimensioned using Rankine's formula:

• Conclusion: Connecting rod (Option 3).

Correct option: (3) Connecting rod

• Traction Tire Lug Geometry & Pitch:
• Lug Pitch: Defined in agricultural tire standards (ASABE / ISO / BIS) as the center-to-center distance between adjacent similar traction lugs on the same side of the tire centerline, measured circumferentially along the outer lug face.
• Related Dimensions:
• Lug height: The radial distance from the tire carcass base to the outer tip of the lug.
• Lug length: The linear distance from the inner root to the shoulder edge along the lug centerline.
• Lug angle: Angle between the lug centerline and the perpendicular to the tire circumferential centerline (typically $23^\circ$ or $45^\circ$).
• Conclusion: Lug pitch (Option 4).

Correct option: (4) Lug pitch