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Which risk increases when exhaust valve timing is misadjusted in an internal combustion engine cycle?

A)Pre-ignition of the air-fuel mixture
B)Insufficient lubrication of cylinder walls
C)Reduced volumetric efficiency of intake
D)Increased residual cylinder gas temperature

💡 Explanation

Increased residual cylinder gas temperature results because incomplete combustion contaminates the subsequent intake cycle via valve overlap affecting the Clearance Volume. This outcome arises through increased Heat Rejection, therefore the hotter gases remain rather than being efficiently purged.

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