What are two ways tension is applied to belts?

The correct answer identifies two effective methods for applying tension to belts in various mechanical systems. A spring-loaded tensioning pulley utilizes a spring mechanism that allows for automatic adjustment of belt tension. This system ensures that the belt remains tight during operation, compensating for wear or stretching that may occur over time. The consistent tension provided by this system helps maintain efficient power transmission and prevents slippage.

A pulley with a jacking bolt offers a different but equally effective method for manually adjusting tension. In this setup, the jacking bolt can be tightened or loosened to change the position of the pulley, thereby increasing or decreasing the tension on the belt. This method allows for precise control of the belt’s tensioning, making it suitable for applications where adjustments may need to be made depending on operational requirements.

Utilizing these methods contributes to the overall reliability and efficiency of mechanical systems that rely on belts for power transmission. The other options, while they describe methods of motion or control, do not specifically pertain to effective and commonly used belt tensioning techniques.