Question 663Steam Plants - Assistant Engineer

The correct answer is A) apply emergency cooling water externally to the bearing. If a line shaft bearing begins to overheat, the first step is to reduce the shaft speed. If the overheating persists, the next step is to apply emergency cooling water externally to the bearing. This helps to lower the bearing temperature and prevent further damage. Decreasing the lube oil pressure (B) or increasing it (C) would not effectively cool the bearing. Flooding the bearing with a higher viscosity oil (D) could potentially worsen the overheating issue.