Question 68 DDE01 - Designated Duty Engineer - Unlimited HP

The Correct Answer is D **Explanation for Option D (Electrically via wire connections):** In modern marine practice, especially involving generator control systems managed from a centralized main switchboard (MSB) control panel, the setting of the engine speed set point for a hydraulic isochronous governor is typically achieved using an electrical signal. The MSB control panel houses the speed control potentiometer or device (often digital or analog). This device generates an electrical command signal (e.g., 4-20 mA or 0-10 V DC) that is sent via electrical wiring to an electronic actuator or transducer mounted directly on or near the hydraulic governor. This actuator then translates the electrical signal into a precise mechanical input that adjusts the governor's speed setting mechanism (often via a solenoid or servo motor), thereby controlling the fuel rack position and engine speed. This method offers high accuracy, rapid response, and easy integration with automated control systems. **Explanation of Incorrect Options:** * **A) Hydraulically via tubing connections:** While the governor itself uses hydraulics to control the fuel rack, using pressurized hydraulic fluid running from the distant MSB control panel to convey the *set point* would be overly complex, messy, and lack the fine control and responsiveness required for precise speed setting. * **B) Mechanically via cable connections:** Mechanical cable connections (like push-pull cables) are sometimes used for short-distance, manual throttle control in older or smaller engines. However, running a mechanical cable from a centralized main switchboard across a busy engine room or deck to a precise, speed-sensitive governor is impractical due to distance, routing complexity, and inherent friction/lag, making precise remote control difficult. * **C) Pneumatically via tubing connections:** Pneumatic systems (using compressed air) were historically used for some remote controls (like large main engine bridge control) but are rarely used for the precise speed set point control of modern generator governors. Electrical signals are far more accurate, faster, and easier to implement for this specific control task.