🔍 Key Concepts

• Notice the labeled parts: oil inlet, impeller, runner, and stator inside a coupling housing • Think about how power can be transmitted through a fluid versus through friction plates, magnets, or air pressure • Remember that some marine clutches/couplings work by circulating a liquid between rotating elements to transmit torque

💭 Think About

• Which of the four choices matches a design that uses an impeller and runner inside a housing filled through an oil inlet? • If there are no visible friction plates, magnetic coils, or air lines, what type of power-transmission method is most likely being used? • How would the presence of a stator between rotating elements influence whether the device works by fluid flow or by direct mechanical contact?

✅ Before You Answer

• Identify whether the working medium shown is oil, magnetic field, air, or solid friction plates • Confirm that impeller, runner, and stator are typical components of one particular type of clutch/coupling used for smooth torque transmission • Verify that the design allows slip between input and output shafts through the working medium rather than direct mechanical engagement