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Question

What is the common cross-sectional shape of a connecting rod used in diesel engines?

This question was previously asked in
RRB NTPC 2025 Graduate Level CBT 1 Question Paper (25-Mar-2026) (Shift 3)
The correct answer is

I-section

The connecting rod links the piston to the crankshaft and must resist heavy compressive and bending loads without buckling.

An I-section shank gives high strength and stiffness for a given weight, because material is concentrated in the flanges away from the neutral axis.

This keeps the rod light, reducing inertia forces, while still resisting buckling along the plane of rotation.

Square, circular, or T-sections would be heavier or weaker for the same duty, so they are not used for the shank.

Hence, the answer is I-section.

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