Question 35Gas Turbine - Assistant Engineer

The correct answer is D) The crosshead. In a controllable pitch propeller (CPP) system, the rotation of the propeller blades is achieved through the axial movement of the crosshead component within the hub body assembly. The crosshead is connected to the propeller blades and, as it moves back and forth, it changes the pitch of the blades, allowing the operator to control the speed and direction of the vessel. The other options are incorrect because: A) The servomotor piston is responsible for providing the motive force to move the crosshead, but it is not the component that directly controls the blade pitch. B) The sliding block is another component in the CPP system, but it is not directly responsible for the blade pitch adjustment. C) The crankpin ring is part of the mechanical linkage that transmits the motion from the servomotor to the crosshead, but it does not directly control the blade pitch.