Which statement describes a valid input path for engine power into the World Transmission gear train during forward operation?

Which statement describes a valid input path for engine power into the World Transmission gear train during forward operation?

• A. P-1 sun gear
• B. P-2 ring gear
• C. P-2 carrier
• D. P-3 sun gear

Answer: (A)

Power entering a World Transmission during forward motion begins at the sun gear of the first planet gear stage. The engine’s torque is applied to this sun gear, which drives the planet gears that mesh with the ring gear. This interaction starts the motion that is passed along the gear train via the carrier, feeding the next stages and ultimately producing forward output. The sun gear of the first stage is the correct entry point because it is the initial component driven by the engine; the other parts listed are not the point where engine power first enters the forward path, either being engaged later in the train or serving other roles in the gear arrangement.

Power entering a World Transmission during forward motion begins at the sun gear of the first planet gear stage. The engine’s torque is applied to this sun gear, which drives the planet gears that mesh with the ring gear. This interaction starts the motion that is passed along the gear train via the carrier, feeding the next stages and ultimately producing forward output. The sun gear of the first stage is the correct entry point because it is the initial component driven by the engine; the other parts listed are not the point where engine power first enters the forward path, either being engaged later in the train or serving other roles in the gear arrangement.