🔍 Key Concepts

• Regenerative braking in an AC propulsion motor (motor acting as a generator) • Relationship between direction of rotation (R) and direction of applied torque (T) in figure B • Effect on ship’s speed when propeller torque opposes or assists its current rotation

💭 Think About

• Look closely at figure B: does the applied torque (T) arrow point in the same or opposite direction as the actual rotation (R) arrow on the propeller? • When a motor is regenerating power back into the mains, is it helping the rotation or opposing it? What does that do to the propeller and ship speed? • Which answer choice correctly combines both: (1) the relative directions of torque and rotation in figure B, and (2) the fact that regeneration is an energy return (braking) mode, not a driving mode?

✅ Before You Answer

• Confirm from the illustration whether power flow direction in B is toward or away from the motor. • Verify whether regeneration is associated with speeding up or slowing down the mechanical system. • Match the option where the stated torque direction relative to rotation exactly matches the arrows labeled R and T in figure B.