🔍 Key Concepts

• Construction of radial bearings in large marine propulsion systems • Materials commonly used for bearing linings in main reduction gears • Differences between alignment features (self-aligning, spherical seated) vs. basic radial bearing design

💭 Think About

• Ask yourself: What is the typical lining material used in many marine journal (radial) bearings to provide a soft, conformable surface? • Which options describe special alignment or seating features, and which option describes something that is common to almost all traditional radial bearings? • Think about what feature would be shared between a turbine main reduction gear bearing and a standard shaft journal bearing on other machinery.

✅ Before You Answer

• Identify which choice refers specifically to lining material, rather than the shape of the housing or mounting. • Eliminate any options that describe alignment/seating geometry rather than the basic bearing similarity. • Recall standard practice: most heavy-duty marine journal bearings use a soft, sacrificial lining bonded to a stronger backing. Which option reflects that?