🔍 Key Concepts

• Main turbine rotors and reduction gears – how high-speed turbine motion is transmitted to lower-speed propeller shafts • Types of flexible couplings – general purpose, typical applications, and how they absorb misalignment or thermal expansion • Labyrinth components – where these are commonly used on turbines (seals vs couplings)

💭 Think About

• Think about which coupling design is best suited to handle slight misalignment and thermal expansion between a high-speed turbine and the reduction gear while still transmitting large power smoothly. • Ask yourself which of these types is more commonly associated with seals and leakage prevention rather than power transmission couplings. • Consider which coupling type you are more likely to see in heavy-duty marine propulsion systems between turbines and reduction gears, not in light machinery or small motors.

✅ Before You Answer

• Eliminate any option that you strongly associate with sealing rather than torque transmission. • Consider which coupling type is designed to handle high torque and misalignment in large rotating machinery like turbines. • Verify in your study materials which flexible coupling types are standard in marine reduction gear installations.