🔍 Key Concepts

• Babbitt metal is a soft, low-friction alloy • Think about what part of machinery needs a sacrificial, low-friction surface • Where is metal needed that can embed small dirt/metal particles instead of scoring a shaft?

💭 Think About

• Which choice describes a surface that regularly rubs against a rotating shaft and must reduce friction? • Which application would benefit from a softer metal supporting a harder, rotating part? • Which of these items is most associated with supporting rotating machinery rather than sealing or impact work?

✅ Before You Answer

• Eliminate any answers that deal mainly with sealing or packing rather than supporting rotation. • Ask: does this part normally need to be hard and impact-resistant, or soft and low-friction? Babbitt is the second type. • Verify which component in marine machinery is designed to wear out first to protect the more expensive part (like a shaft).