Question 28 UFIV01 - Chief Engineer - UFIV

The Correct Answer is B. **Explanation for Option B (The governed speed setting) being correct:** Item \#2 in a mechanical speed control governor (often depicted as a knurled knob or adjustment screw connected to the spring tension mechanism) is typically the **speed setting adjustment** (or manual speed changer). By adjusting item \#2, the tension on the main speeder spring (which counteracts the centrifugal force of the flyweights) is changed. Increasing the spring tension requires the engine to run faster (higher RPM) to generate enough centrifugal force to overcome that tension and move the fuel rack to maintain the set speed. Decreasing the tension lowers the required speed. Therefore, adjusting item \#2 directly changes the **governed speed setting** (the desired speed at which the governor maintains the engine operation). **Explanation for why the other options are incorrect:** * **A) The speed droop setting:** Speed droop determines how much the engine speed decreases as the load increases. This adjustment is usually controlled by a separate mechanism (often a linkage pivot point adjustment) that modifies the mechanical leverage ratio between the governor output and the fuel rack/throttle, not the main speed setting knob (item \#2). * **C) The minimum low speed setting:** The minimum low speed (idle speed) is typically controlled by a separate mechanical stop or adjustment that limits the travel of the fuel rack/throttle at the minimum speed position. While related to engine operation, it is not the function of the main speed setting adjustment used during normal governing operation. * **D) The maximum high speed setting:** While the governed speed could be set to the engine's maximum safe speed limit, the maximum mechanical limit of the governor's action is usually determined by internal physical stops or a separate high-limit stop adjustment. Item \#2 adjusts the **operating speed within the governor's range**, not the fixed, physical maximum design limit of the engine or the governor mechanism itself.