Question 660Steam Plants - Assistant Engineer

The correct answer is A) Check the bearing for proper lubrication. When the temperature of a line shaft bearing increases above its normal operating temperature, the immediate action should be to check the bearing for proper lubrication. This is because inadequate or improper lubrication is one of the most common causes of bearing overheating. Checking the lubrication level and condition can help identify and address the root cause of the temperature increase before it leads to more serious issues. The other options, while potentially necessary, are not the immediate actions that should be taken. Stopping the unit and replacing the bearing (B) or stopping the unit and inspecting the bearing (D) would be premature without first checking the lubrication. Checking the water circulation to the lube oil coolers (C) may be necessary if the lubrication check indicates a problem with the cooling system, but this should not be the first step.