🔍 Key Concepts

• Propeller cavitation and how bubbles form on blade surfaces • Effects of water pressure and flow around a turning propeller • Operating conditions that change propeller load and efficiency

💭 Think About

• Which option describes a condition that can create bubbles or voids on the propeller blade surface? • Which of these situations is most commonly linked to noise, pitting, and vibration in real-world propeller operation? • Do deep water or low vessel speeds typically increase or decrease the chance of unstable flow at the propeller?

✅ Before You Answer

• Identify which choice is directly associated with bubble formation and collapse on propeller blades • Eliminate any choices that are normal operating conditions and not usually a cause of vibration by themselves • Focus on the option that marine engineers specifically name as a main source of propeller noise, erosion, and vibration