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Which process limits diesel engine efficiency at altitude?

A)Reduced inlet air density
B)Increased fuel cetane number
C)Decreased cylinder wall temperature
D)Elevated exhaust back pressure

💡 Explanation

Reduced air density at altitude causes incomplete combustion because less oxygen is available for oxidizing the fuel during compression ignition. This lowers the heat release compared to ideal conditions; therefore efficiency drops due to poor energy transfer rather than complete fuel oxidation.

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