The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these rings is to __________.

Correct Answer: Option A — prevent the external leakage of oil out of the bearing housing

Oil deflector rings installed adjacent to bearing housings form a tight mechanical and aerodynamic barrier that prevents lubricating oil from escaping externally along the turbine shaft into the engine room or onto hot steam casing lagging.