Answer :
Final answer:
The motion of the cam is transferred to the valves through rocker arms, which pivot to push the valves open in time with the engine's combustion cycle. The correct option is b.
Explanation:
The motion of the cam is transferred to the valves through rocker arms. When the camshaft rotates, it lifts each follower according to a specific profile, defined by the shape of the cam. As the follower moves, it actuates the valves via the rocker arms, which pivot and push down on the valves, opening them to allow fuel and air into the cylinder, or to let exhaust gases out.
In the context of a four-stroke engine, the camshaft is geared to the crankshaft, ensuring that the motion is accurately timed with the engine's combustion cycle. The rocker arms play a critical role in this process, transferring the rotational motion of the camshaft into vertical motion that operates the valves.
