🔍 Key Concepts

• Speed droop on a diesel generator governor and what it does as load increases • How generators share load when operating in parallel on the same bus • The meaning of zero droop (isochronous) speed control in governing systems

💭 Think About

• Think about what happens to engine speed on a droop governor when electrical load is added. How does frequency (speed) normally change as load increases? • If one generator in parallel is set to zero droop while the others have normal droop, what does that do to its tendency to pick up or shed load compared to the others? • Which choice best describes a generator whose speed setting does not change with changing load, and how that affects its kW sharing with other units?

✅ Before You Answer

• Identify which option describes no change in speed with changing load (isochronous behavior). • Eliminate any options that talk about gradual speed reduction as load is applied, because that is characteristic of positive droop, not zero droop. • Check which answer focuses on speed behavior under changing load, rather than on general fuel control or automatic load division.