Question 533Steam Plants - Assistant Engineer

The correct answer is C) journal bearings. The radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine's journal bearings. Journal bearings support the rotating shaft and allow it to spin freely while preventing excessive radial movement. This controlled radial clearance is crucial for the proper operation and efficiency of the turbine. The other options are incorrect because interstage packing (A) is used to prevent leakage between turbine stages, thrust bearings (B) are responsible for supporting the axial loads, and diaphragms (D) are stationary components that guide the flow of steam through the turbine stages.