🔍 Key Concepts

• Mechanical vs. hydraulic governors and what drives each type • How centrifugal force on flyweights is used in speed governing systems • The meaning of direct-acting in a governor (no external power assist)

💭 Think About

• Ask yourself: In a direct acting mechanical governor, what provides the energy to move the fuel control linkage—engine-driven oil pressure, or rotating mass? • Think about how traditional flyball or flyweight governors on steam engines or early diesels work—what actually moves when speed increases? • Which choices describe power-assisted or indirect motion, and which describe a force coming straight from the rotating governor itself?

✅ Before You Answer

• Verify which option involves rotating weights reacting to speed of the engine shaft • Identify which options (if any) involve hydraulic or servo assistance, which would NOT be purely direct acting • Confirm that in a direct acting mechanical governor, the same rotating shaft that senses speed also provides the motion to the fuel control linkage without extra power devices