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Kinematic pairs in a locomotive's coupling rod: Each of the four joints corresponds to which pair type? Assume ideal pin joints at all connections in the coupling rod assembly. Choose the correct option.

Difficulty: Easy

Sliding pair
Turning (revolute) pair
Rolling pair
Screw pair
Cylindrical pair

Correct Answer: Turning (revolute) pair

Explanation:

Given data

Coupling rod with pin-jointed ends (typical locomotive practice).

Concept / Approach
A turning (revolute) pair permits relative rotation about a fixed axis—exactly what a pin joint provides.

Reasoning
All four joints are pin joints; no sliding or screw motion is intended—hence revolute pairs.

Final Answer
Turning (revolute) pair

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