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← ScienceWhich outcome occurs when the compression ratio in an ideal Otto cycle engine increases beyond design limits?
A)Increased thermal efficiency reaches plateau✓
B)Decreased nitric oxide formation in exhaust
C)Reduced cycle time caused faster burn
D)Higher energy cost due to lower fuel
💡 Explanation
When compression ratio increases too much, increased thermal efficiency begins to diminish from non-ideal effects because of heat losses through the cylinder walls and incomplete combustion, limiting any further gains. Therefore efficiency plateaus, instead of decreased NOx, faster burn, or reduced fuel costs, which depend on distinct factors.
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