Question 391Steam Plants - 1st Asst/Chief

The correct answer is C) oil clearance and bearing wear. The readings obtained with a bridge gage on a main propulsion turbine bearing represent the oil clearance and bearing wear. This is because the bridge gage is used to measure the clearance between the rotating shaft and the stationary bearing housing, which indicates the amount of bearing wear over time. The oil clearance is critical for maintaining proper lubrication and preventing excessive friction and heat buildup in the bearing. The other options are incorrect because they do not accurately represent the information provided by a bridge gage measurement on a main propulsion turbine bearing. Diaphragm tip clearance (A), Babbitt thickness (B), and blade axial clearance (D) are not directly measured by this type of gauge on this specific component.