What is the most common type of chain used for mechanical drive?

• A. Link chain
• B. Roller chain
• C. Leaf chain
• D. Silent chain

Answer: (B)

Roller chain is used most often in mechanical drives because its rollers ride on the sprocket teeth, dramatically reducing friction and wear while allowing smooth, efficient power transfer over a wide range of speeds and loads. The rolling action distributes load along many links, makes lubrication effective, and supports reliable operation in conveyors, machinery, and other industrial drives.

A simple link chain would slide over the teeth with higher friction and wear, making it less efficient for continuous power transmission. Leaf chain is built for lifting and heavy vertical loads, not for smooth, high-speed drive applications. Silent chain can run quietly and handle high speeds, but it requires tighter tolerances, careful alignment, and higher cost, so it isn’t as widely adopted for general drives.