The three (3) basic components of a chain drive system are__________.

• A. chain, driver sprocket, and driven sprocket
• B. chain, gear, and shaft
• C. belt, pulley, and rider
• D. sprocket, chain, and bearing

Answer: (A)

Power is transmitted from one shaft to another through a chain drive by using a chain wrapped around two sprockets that mesh with the chain links. The chain provides the flexible, continuous link that carries the torque, while the two sprockets—one connected to the driving shaft (the source of motion) and the other connected to the driven shaft (the output)—form the interfaces where torque is transferred. Together, the chain and these two sprockets establish the path of motion and allow the output shaft to rotate when the input shaft turns.

This is why this trio is the proper set: without the chain, there’s no continuous link to convey torque between shafts; without either sprocket, the chain has nothing to engage to transfer that motion. The other options describe different systems (belt drive with pulleys, or gear/shaft setups) and a bearing, which aren’t the essential components of a chain drive.