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Which of the mentioned bellow is a disadvantage of a poppet valve?

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Which of the mentioned bellow is a disadvantage of a poppet valve?

(a) Cold start wear

(b) Higher overall valve train efficiency

(c) Cylinder deactivation

(d) Valve stem scuffing
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Right answer is (d) Valve stem scuffing

The explanation is: Valve stem scuffing is due to geometrical irregularities or over-speeding. This can be corrected by bent or slanted valve, which may need replacement.
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