🔍 Key Concepts

• Function of grease lubricants in machinery bearings • Effects of contaminants (like dirt) in lubrication systems • Difference between abrasion, corrosion, and flammability in maintenance contexts

💭 Think About

• Think about what physically happens inside a bearing if small hard particles are mixed into the grease that separates moving metal surfaces. • Consider which option describes a COMMON, real‑world maintenance problem seen when machinery isn’t kept clean and properly lubricated. • Ask yourself: which effect would be the most direct and immediate result of dirt mixing with grease in a bearing?

✅ Before You Answer

• Identify which choice describes an effect related to mechanical wear between metal surfaces. • Eliminate any option that suggests a result that is chemically unlikely or not typically associated with grease and dirt. • Focus on the option that aligns with standard maintenance guidance: keep lubricants clean to avoid premature wear of bearings.