What is the recommended center-to-center distance between sprockets as a multiple of the larger sprocket?

The correct center-to-center distance between sprockets is often recommended to be a multiple of the larger sprocket's pitch diameter for optimal performance in a chain drive system. When considering the ratio of the center-to-center distance, the option that states 1 1/2 times the larger sprocket provides a balance between adequate chain wrap and minimizing chain slack. This distance allows for smooth operation and reduces the risk of excessive wear on both the chain and the sprockets.

A ratio of 1 1/2 allows for proper tensioning of the chain, which is essential to maintain contact between the chain and sprocket teeth. This minimizes slippage and ensures efficient power transfer between the two sprockets. Consequently, the design meets mechanical design standards while accommodating factors like chain sag and adjustment over the machine's lifecycle.

The other options do not align as closely with the optimal design criteria needed for the functioning of chain-driven systems, potentially leading to improper tensioning or inefficient operation.