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Which risk increases when diesel engine turbocharger bearings experience inadequate lubrication at start-up?

A)Compressor surge due to impeller imbalance
B)Increased exhaust backpressure after turbine
C)Early onset of bearing wear and seizure
D)Fuel injector fouling due to oil contamination

💡 Explanation

When a turbocharger experiences inadequate lubrication at startup, boundary lubrication occurs because the oil film is insufficient to separate the bearing surfaces, leading to increased friction and wear. Therefore, early bearing wear and seizure results, rather than compressor surge, backpressure, or injector fouling which require other failure mechanisms.

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