A characteristic of a bearing material which...

🔍 Key Concepts

• Bearing materials and journals – what is the purpose of using a softer bearing material against a harder shaft (journal)? • Foreign particle behavior – what happens when dirt or metal particles are in the lube oil film between bearing and journal? • Damage mechanisms – compare damage to the hard journal vs. the softer bearing surface if particles are present.

💭 Think About

• Think about which part is more expensive and critical to protect: the bearing or the journal (shaft). • If a small hard particle is in the oil film, what will cause more long‑term damage: the particle constantly rubbing on the journal surface, or that particle being trapped somewhere else? • Which options confuse the role of filters versus the function of the bearing material itself?

✅ Before You Answer

• Identify which component (bearing or journal) is designed to be sacrificial/softer. • Decide whether embedding particles in the bearing would tend to protect or harm the journal surface over time. • Check which answer choices incorrectly attribute a filtering/flow function to the bearing rather than to the lube oil system.

A characteristic of a bearing material which permits small dirt particles to become embedded in the bearing surface is __________.

desirable, as it will minimize damage to the journal surface

desirable, as it will assist in keeping the lube oil filters clean

undesirable, since the embedded particles will score the journal

undesirable, since the particles will interfere with lube oil flow

🔍 Key Concepts

💭 Think About

✅ Before You Answer