🔍 Key Concepts

• Journal bearings vs. antifriction bearings (ball/roller) and how they handle misalignment • The shape and mounting of spherically seated bearings and how that affects alignment • How shaft misalignment is typically compensated in high-speed turbine installations

💭 Think About

• Think about which bearing design allows the bearing surface to change its angle slightly while still fully supporting the shaft. • Ask yourself: which of these choices is specifically designed so its seating or housing can swivel relative to the shaft centerline? • Consider which bearing types (ball/roller) are more sensitive to misalignment versus which types can tolerate small angular errors.

✅ Before You Answer

• Verify which option is actually a journal bearing (not a rolling-element/antifriction bearing). • Check which bearing has a spherical seat or housing that can self-align with the shaft. • Confirm which type is commonly used with turbine shafts where small misalignments must be accommodated smoothly.