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Piston rod function: identify the correct role in a reciprocating steam engine. Select the statement that correctly describes the function of a piston rod.

Difficulty: Easy

To guide motion of the piston rod and prevent it from bending
To transfer motion from the piston to the crosshead
To convert the heat energy of steam directly into mechanical work
To exhaust steam from the cylinder at the proper moment

Correct Answer: To transfer motion from the piston to the crosshead

Explanation:

Concept
The piston rod connects the piston to the crosshead, transmitting reciprocating motion. Guidance and bending control are duties of the crosshead (Option A), energy conversion occurs in the cylinder by piston expansion work (Option C), and exhaust timing is controlled by the valve gear (Option D).

Final Answer
To transfer motion from the piston to the crosshead

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Piston rod function: identify the correct role in a reciprocating steam engine. Select the statement that correctly describes the function of a piston rod.

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