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← ScienceWhich outcome occurs when exceeding a diesel engine's cooling capacity?
A)Cylinder head experiences thermal fatigue✓
B)Fuel viscosity increases exponentially
C)Engine oil oxidizes more slowly
D)Volumetric efficiency improves noticeably
💡 Explanation
Exceeding cooling capacity causes overheating, which induces thermal stress cycles; because the metal repeatedly expands then contracts, the cylinder head experiences fatigue cracking, therefore choosing A, rather than increased fuel viscosity or improved efficiency under these conditions.
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