Question 663Steam Plants - Assistant Engineer

70% to pass

If a line shaft bearing begins to overheat, the shaft speed should be reduced. If overheating persists, you should then _______________.

Aapply emergency cooling water externally to the bearing

Bdecrease lube oil pressure to the bearing

Cincrease lube oil pressure to the bearing

Dflood the bearing with a higher viscosity oil to provide emergency lubrication and cooling

AI Explanation

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.