Question 344General Subjects - Assistant Engineer

The correct answer is C. The main purpose of the main thrust bearing is to absorb axial thrust and to transmit the axial thrust developed by the propeller to the ship's hull. The main thrust bearing is designed to counteract the axial forces generated by the propeller, which tend to push the shaft forward or backward. By absorbing and transmitting this axial thrust to the ship's hull, the main thrust bearing ensures the proper alignment and positioning of the propeller shaft, which is critical for the efficient and safe operation of the vessel. The other options are incorrect because they do not accurately describe the primary function of the main thrust bearing. Option A refers to maintaining shaft alignment, which is a secondary function. Options B and D mention radial thrust, which is not the main purpose of the main thrust bearing.