đ Key Concepts
⢠Types of bearing damage and what each typically looks like (cracks, scoring, wiping, pitting)
⢠How repeated loading vs. poor lubrication vs. misalignment affect a crankshaft bearing surface
⢠Relationship between surface cracking and cyclic stress over time in rotating machinery
đ Think About
⢠Which of the answer choices would most likely create small surface cracks rather than just discoloration, scoring, or overheating marks?
⢠Think about which condition develops gradually from many load cycles, even when lubrication is otherwise acceptable.
⢠For each option, ask: would this mainly cause heat and wear, uneven contact, or tiny cracks from repeated stress?
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Before You Answer
⢠Match "small cracks" specifically to the damage mechanism: not just wear or discoloration.
⢠Consider that insufficient lubrication usually shows up first as scoring, wiping, or overheating rather than fine cracking.
⢠Ask whether misalignment alone would produce cracks, or more commonly uneven wear patterns and localized contact.