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The opening of valves is due to which motion of the rocker arm?

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The opening of valves is due to which motion of the rocker arm?

(a) Tangential motion

(b) Reciprocating motion

(c) Oscillatory motion

(d) Rotating motion

This question was posed to me in an online interview.

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

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The correct choice is (c) Oscillatory motion

For explanation: The opening of valves is due to the oscillatory motion of the rocker arm. This is due to the force by initial compression presses the valve down on its seat.

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