🔍 Key Concepts

• Identify how an overrunning / self‑shifting clutch works in a turbine or reduction gear system. • Compare the roles of the input assembly and output assembly shown in the illustration, and notice the engaged/disengaged switch mechanism and relay assembly. • Consider whether any external power source (air, hydraulics, manual lever) is shown as necessary for engagement.

💭 Think About

• From the labels in the illustration, ask yourself: does this clutch appear to require a separate pneumatic or hydraulic line, or does it seem to respond to shaft motion and internal mechanisms? • Think about which shaft (input vs. output) must change speed or begin rotating first to cause the internal elements to move into engagement. • Look at the function of an overrunning clutch: does it typically engage when the driving member overtakes the driven member, or only when the driven member starts turning?

✅ Before You Answer

• Verify which choice describes engagement based on a speed relationship between input and output shafts, not on an outside power source. • Confirm whether the picture shows any pneumatic cylinder, air line, or manual lever that would be required for options A or D. • Make sure the option you choose matches a clutch that engages automatically through internal mechanisms when the proper speed difference exists between the shafts.