🔍 Key Concepts

• lubrication and friction in bearings • effects of insufficient or poor-quality lube oil on bearing temperature • relationship between bearing load and heat generation

💭 Think About

• For each option, ask yourself: Would this condition increase friction between moving surfaces in the bearing? • Think about how too little oil, dirty oil, or extra load each affect the thickness and quality of the oil film between bearing surfaces. • Consider whether more than one of these conditions could reasonably cause a bearing to run hotter than normal.

✅ Before You Answer

• For each choice, verify whether it would reduce effective lubrication or increase friction in the bearing. • Check if contaminated lube oil can act similarly to having less oil or more resistance between surfaces. • Decide if excessive loading on a bearing, even with good oil, can still raise bearing temperature.