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Which outcome occurs when rapidly compressing a diesel engine's fuel-air mixture?

A)Spontaneous fuel ignition will occur
B)Pre-ignition knocking will decrease
C)Volumetric efficiency will substantially increase
D)Exhaust emissions of NOx severely decrease

💡 Explanation

Spontaneous fuel ignition happens because adiabatic compression causes significant temperature rise. Ignition occurs when the autoignition temperature is reached; therefore, fuel ignites without a spark plug, rather than pre-ignition (spark timing effects) or exhaust gas changes.

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