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In a normally operating engine, intake and exhaust valves are opened by a cam and closed by:

A. valve guides and/or pushrods.
B. rocker arms or cam follower.
C. valve springs.
D. lifters/tappets.

Answer :

Final answer:

In a normally operating engine, valve springs are responsible for closing the intake and exhaust valves after they have been opened by a cam.


Explanation:

In a normally operating engine, intake and exhaust valves are closed by valve springs. These springs push the valves back into their closed position after they have been opened by a cam. The cam is responsible for opening the valves, while the valve springs provide the necessary force to close them. Other components like lifters/tappets, rocker arms or cam followers, and valve guides and/or pushrods are part of the valve train system and assist in the opening and closing actions of the valves.


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