🔍 Key Concepts

• Friction and power loss in different types of bearings (sleeve vs roller/ball) • How lubrication requirements typically compare between plain bearings and precision roller bearings • What makes a bearing suitable for variable speed operation and long-term alignment

💭 Think About

• Think about whether precision roller bearings are usually chosen because they waste a lot of power, or because they operate efficiently. • Compare which bearing type normally needs more constant lubrication attention: plain (sleeve) bearings or precision roller bearings. • Ask yourself: Are precision bearings known for holding tight tolerances and keeping shafts aligned over time, or for losing alignment easily?

✅ Before You Answer

• Verify which option describes low vs high friction losses in roller bearings. • Check which statement matches the usual advantages of precision roller bearings in machinery design, rather than their disadvantages. • Eliminate any choices that clearly describe problems more typical of plain (sleeve) bearings rather than roller bearings.