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← ScienceWhich outcome occurs when the compression ratio in a Diesel cycle engine increases beyond design specifications?
A)Engine knock from premature ignition✓
B)Reduced power output due to incomplete combustion
C)Increased exhaust emissions of unburnt fuel
D)Thermal runaway from decreased cooling efficiency
💡 Explanation
When compression ratio increases excessively, autoignition temperature is reached too early via adiabatic compression because temperature increases with pressure, leading to uncontrolled combustion (engine knock). Therefore, engine knock results, rather than reduced power, increased emissions, or thermal runaway all needing different process deviations.
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