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Which outcome occurs when a diesel engine’s turbocharger vanes become encrusted with combustion deposits?

A)Transient boost response degradation
B)Compressor surge margin increases
C)Reduced exhaust gas temperature
D)Improved fuel-air homogenization

💡 Explanation

Decreased vane movement affects geometry and increases the rotational inertia; boost response slows dramatically. This is due to **variable geometry turbo lag** causing the turbine performance to drop, therefore, a sluggish response results rather than improved performance under dynamic load changes.

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