Which risk increases when unbalanced harmonic excitation affects an engine crankshaft?

💡 Explanation

Harmonic excitation near the crankshaft's natural frequency causes resonance, therefore significantly increasing torsional stress leading to fatigue failure, rather than pre-ignition; because scavenging and blowby relate to combustion and sealing of gases rather than mechanical stresses.

• Which risk increases when seawater permeates concrete rebar supports?
• Which risk increases when excessive Optical Carrier (OC) signals are added to a SONET fiber optic network?
• Which critical issue arises when high-strength steel beams experience Hydrogen Embrittlement near welded joints?
• Which increased flight control instability results when an aircraft experiences flutter?
• Which risk increases when steam injection during concrete curing elevates humidity prematurely in a pre-stressed beam?
• Which outcome results when harmonic currents circulate neutral return of electrical power distribution circuits?