Which operational hazard develops when lubricating oil supply to a turbocharger bearing fails in a diesel engine?

💡 Explanation

When oil supply fails, boundary lubrication transitions to dry friction at the turbine shaft bearings because heat dissipation plummets, leading to rapid temperature rise and differential thermal expansion of the rotor. Therefore rotor seizure occurs, rather than surge, dilution, or pre-ignition, which require related but distinct failure mechanisms.

• Which risk increases when a turbocharger impeller overspeeds beyond crankshaft's torsional resonance frequency due to boost control failure?
• Which risk substantially increases when inlet guide vanes on a jet engine's turbine fail to adjust optimally?
• Which outcome occurs when a three-phase transformer operates with undetected, excessive harmonic currents?
• In a two-stage cascade refrigeration system, which outcome occurs when the intermediate refrigerant experiences excessive superheating?
• Which outcome occurs when a refrigeration system uses an immiscible refrigerant blend circulating at low temperatures?
• Which risk increases when exceeding tolerance limits in forging?