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When valves are closed which pressure is built inside the cylinder?

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When valves are closed which pressure is built inside the cylinder?

(a) Neutral pressure

(b) Positive pressure

(c) Negative pressure

(d) Zero pressure

I got this question in an interview.

This intriguing question comes from IC Engine in chapter Design of IC Engine Components of Automotive Engine Design

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The correct answer is (c) Negative pressure

For explanation: The purpose of the valve spring is to exert force on the rocker arm and When valves are closed negative pressure is built inside the engine cylinder.

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