🔍 Key Concepts

• Diesel propulsion power ratings (maximum continuous rating vs. normal sea speed) • Difference between ahead power and astern power requirements • What "continuous operation astern" practically means for a seagoing vessel

💭 Think About

• Ask yourself: Is the regulation more concerned with matching full ahead power, or with providing sufficient and safe astern power during normal service? • Think about what speed condition is most realistic for designing continuous astern power: maximum rated speed, average continuous sea speed, or just any underway condition? • Which choice sounds like a design/engineering standard rather than a loose operational description?

✅ Before You Answer

• Identify which options give a specific, quantifiable design criterion (e.g., a percentage of rpm at a defined speed) • Check which option clearly ties astern power to a normal service condition, not an extreme or rarely used condition • Eliminate any answer that is just a general statement without a measurable engineering standard