Question 59

The Correct Answer is B **Explanation for Option B (vane type steering gear):** The illustration (GS-0116) depicts a common type of rotary hydraulic actuator used for moving a ship's rudder. This device is characterized by a circular housing containing internal fixed vanes and vanes attached to a rotor (the rudder stock). Hydraulic fluid is pumped into chambers between these vanes. By pressuring one side, the rotor is forced to turn, providing the necessary high torque to move the rudder. This mechanism is the defining structure of a vane type steering gear. **Explanation why other options are incorrect:** * **A) diesel engine motor mount:** A motor mount is a structural component (often a simple bracket or elastomeric pad) used to secure an engine to a foundation and absorb vibration. It is a static support, not a complex hydraulic rotating mechanism. * **C) oil scraper ring stuffing box for a crosshead engine:** A stuffing box is a sealing device designed to prevent fluid leakage along a reciprocating rod (like a piston rod). While vital for sealing, it does not function as a large-scale, high-torque rotary actuator for steering. * **D) mechanical shaft seal:** A mechanical shaft seal is a small component used to prevent leakage along a rotating shaft. The device shown is the entire steering apparatus (the actuator), not just an isolated sealing element.