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Which outcome occurs when an exhaust valve sticks open in a high-performance internal combustion engine?

A)Reduced brake horsepower and thermal efficiency
B)Increased valve overlap and scavenging flow
C)Enhanced cylinder pressure during intake
D)Optimal air-fuel mixture within manifold

💡 Explanation

Reduced brake horsepower and fuel efficiency results because increased backpressure acts against the piston’s work during other strokes; rather than enhancing cylinder dynamics, incomplete combustion reduces power due to compression inefficiency.

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