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Answer :
Final answer:
In an engine, the intake and exhaust valves are opened by a camshaft but are closed primarily by valve springs. Other components assist in the operation of the valves but do not perform the closing function. Thus, the correct answer to the question is B) valve springs.
Explanation:
Understanding Engine Valves
In a normally operating engine, the intake and exhaust valves are critical components that control the flow of air and fuel into the engine and the exit of combustion gases. These valves are opened by a camshaft, which rotates and pushes the valves open at specific times during the power cycle of the engine.
However, these valves cannot remain open indefinitely. They must be closed to create the necessary compression in the combustion chamber and to allow for the proper timing of the next intake or exhaust cycle. The primary mechanism responsible for closing these valves is the valve springs. These springs provide the force needed to pull the valves back into their closed position once the camshaft has moved away from them.
Let's break down the other options to clarify why they are incorrect:
- A) Valve guides and/or pushrods: These components assist in the support and operation of the valves but do not close them.
- C) Rocker arms or cam follower: These are parts that transmit the motion from the camshaft to the valves, opening them, but they do not close.
- D) Lifters/tappets: These components are involved in the valve actuation process but do not directly close the valves.
In conclusion, the correct answer is B) valve springs, as they are the components that ensure the valves close after being opened by the camshaft.
Learn more about Engine Valve Operation here:
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