Machine Design MCQ Questions & Answers | Mechanical Engineering

A cotter joint is a type of mechanical connection used to connect two rods together.

1. Co-axial Rods:
The cotter joint is specifically designed to connect co-axial rods, meaning the rods are aligned along the same axis. This ensures that the rods remain in alignment and can transmit motion or force effectively along the same line.

2. Perpendicular Rods:
If the rods were perpendicular to each other, a different type of joint would be required, such as a pin joint or a universal joint. The cotter joint is not suitable for perpendicular rods.

3. Parallel Rods:
Parallel rods may be connected using other types of joints, but not a cotter joint, as this joint is meant for rods that are co-axial.

Therefore, the correct answer is Option A: Co-axial.

Definition: A transverse fillet weld is a weld where the axis of the weld is placed perpendicular to the direction of the applied load.

Load action: In a transverse fillet welded joint, the load is applied across the throat of the weld, which results in shear stresses being developed in the weld material.

Design basis: Since the primary mode of failure for this type of weld is due to shear across the throat area, the joint is designed considering the shear strength of the weld metal.

Reason: Designing for shear strength ensures that the weld can safely resist the applied load without shear failure, thus maintaining the integrity of the joint.

Conclusion: Transverse fillet welded joints are always designed based on their shear strength.