🔍 Key Concepts

• Journal bearing lubrication and how oil forms a film between the shaft and bearing surface • The function of relieved (recessed) areas in Babbitt at oil inlets • How hydraulic pressure or oil wedge formation behaves when the shaft/rotor is turning

💭 Think About

• Think about what happens to the oil right at the point where it first enters between the shaft and the bearing: do you want more pressure there, less pressure, or better distribution? • Which option best matches the goal of creating a smooth, continuous oil film around the journal instead of trapping or resisting the oil? • Consider what problem would occur if the Babbitt surface were not relieved at the oil entry point—would oil move freely, or could it be blocked or pressurized excessively?

✅ Before You Answer

• Identify which choices deal with oil flow and film formation around the shaft, not just supply line behavior • Ask whether the bearing design is aimed at avoiding trapped pressure or at ensuring proper oil pickup and distribution by the rotating journal • Eliminate any option that focuses only on the external system (supply line or discharge) rather than the interface between journal and bearing at the oil entry point