🔍 Key Concepts

• Isochronous governor characteristics in diesel engines • Meaning of speed droop and what a zero droop setting implies • Relationship between engine speed, load changes, and fuel supply in governor-controlled systems

💭 Think About

• Think about what an isochronous governor is designed to do with respect to engine speed when the load increases or decreases. • Ask yourself: if the speed droop is set to zero, how much change in speed is the governor trying to allow as load changes? • Consider which of the answer choices describes behavior that matches a governor whose main purpose is to keep speed nearly unchanged under varying load.

✅ Before You Answer

• Be clear on the difference between droop control (speed decreases as load increases) and isochronous control (speed remains the same with load changes). • Check which options describe unstable or unsafe behavior that a properly adjusted governor is specifically designed to avoid. • Verify which choice best matches a system where fuel flow is automatically adjusted to maintain nearly constant speed as load varies.